1
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Soltan S, Macke S, Ilse SE, Pennycook T, Zhang ZL, Christiani G, Benckiser E, Schütz G, Goering E. Ferromagnetic order controlled by the magnetic interface of LaNiO 3/La 2/3Ca 1/3MnO 3 superlattices. Sci Rep 2023; 13:3847. [PMID: 36890187 PMCID: PMC9995495 DOI: 10.1038/s41598-023-30814-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 03/01/2023] [Indexed: 03/10/2023] Open
Abstract
Interface engineering in complex oxide superlattices is a growing field, enabling manipulation of the exceptional properties of these materials, and also providing access to new phases and emergent physical phenomena. Here we demonstrate how interfacial interactions can induce a complex charge and spin structure in a bulk paramagnetic material. We investigate a superlattice (SLs) consisting of paramagnetic LaNiO3 (LNO) and highly spin-polarized ferromagnetic La2/3Ca1/3MnO3 (LCMO), grown on SrTiO3 (001) substrate. We observed emerging magnetism in LNO through an exchange bias mechanism at the interfaces in X-ray resonant magnetic reflectivity. We find non-symmetric interface induced magnetization profiles in LNO and LCMO which we relate to a periodic complex charge and spin superstructure. High resolution scanning transmission electron microscopy images reveal that the upper and lower interfaces exhibit no significant structural variations. The different long range magnetic order emerging in LNO layers demonstrates the enormous potential of interfacial reconstruction as a tool for tailored electronic properties.
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Affiliation(s)
- S Soltan
- Physics Department, Faculty of Science, Helwan University, Helwan, Cairo, 11798, Egypt. .,Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany. .,Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany.
| | - S Macke
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - S E Ilse
- Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany
| | - T Pennycook
- EMAT, University of Antwerp Campus Groenenborger, 2020, Antwerp, Belgium.,Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090, Vienna, Austria
| | - Z L Zhang
- Erich-Schmid-Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700, Leoben, Austria
| | - G Christiani
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - E Benckiser
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - G Schütz
- Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany
| | - E Goering
- Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569, Stuttgart, Germany.
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2
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Setia A, Mehata AK, Vikas, Malik AK, Viswanadh MK, Muthu MS. Theranostic magnetic nanoparticles: Synthesis, properties, toxicity, and emerging trends for biomedical applications. J Drug Deliv Sci Technol 2023. [DOI: 10.1016/j.jddst.2023.104295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
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3
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Li J, Gong A, Li X, He Y, Li J, Bai Y, Fan R. Structure, thermostability and magnetic properties of cubic Ce 2-x Ti 2O 7 pyrochlore obtained via sol-gel preparation. RSC Adv 2022; 12:15348-15353. [PMID: 35734022 PMCID: PMC9149866 DOI: 10.1039/d2ra01714h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 04/08/2022] [Indexed: 11/23/2022] Open
Abstract
Lanthanum-based titanates have been attracting considerable interest by virtue of their structural operability and hence diverse physical properties. The preparation of lanthanum-based titanates with novel crystal structure is a fascinating task. In this work, we report the preparation of a cubic Ce2−xTi2O7 pyrochlore using the sol–gel method. The crystal structure, thermostability and magnetism were studied via the temperature dependence of X-ray powder diffraction, X-ray photoelectron spectroscopy and magnetization measurements. It has been revealed that the as-prepared Ce2−xTi2O7 pyrochlore possesses a cubic symmetry (space group: Fd3̄m), however there is an 18(1)% vacancy of Ce ions in the as-prepared samples. No distinct phase transition and thermal expansion anomaly were observed in the investigated temperature range from 300 K to 700 K. Intriguingly, lattice defects may favor the transformation of Ce valence from +3 to +4 and an unusual weak magnetic ordering state emerged up to 400 K. The persistence of magnetism at such high temperatures is rare and mysterious for cerium titanates. Our findings provide the possibility of adjusting the crystal structure and magnetic properties of cerium titanates, anticipated to the development of lanthanum-based oxides. We report a novel cubic Ce2−xTi2O7 compound prepared via the sol–gel method. There is an 18% vacancy of Ce ions in the as-prepared samples. The lattice defects may favor the transformation of Ce valence from +4 to +3, and a weak magnetic ordering state emerges up to 400 K.![]()
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Affiliation(s)
- Jiandi Li
- College of Chemistry and Biological Engineering, University of Science and Technology Beijing Beijing 100083 China
| | - Aijun Gong
- College of Chemistry and Biological Engineering, University of Science and Technology Beijing Beijing 100083 China .,Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, University of Science and Technology Beijing Beijing 100083 China
| | - Xingyan Li
- College of Chemistry and Biological Engineering, University of Science and Technology Beijing Beijing 100083 China
| | - Yanfei He
- College of Chemistry and Biological Engineering, University of Science and Technology Beijing Beijing 100083 China
| | - Jinsheng Li
- College of Chemistry and Biological Engineering, University of Science and Technology Beijing Beijing 100083 China
| | - Yuzhen Bai
- College of Chemistry and Biological Engineering, University of Science and Technology Beijing Beijing 100083 China
| | - Rongrong Fan
- Kunshan Hexin Mass Spectrometry Technology Co, Ltd Jiangsu 215300 China
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4
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Dutta J, Ravi S, Mukherjee S, Ojha AK, Adhikari S. Jahn-Teller Effect in Orthorhombic Manganites: Ab Initio Hamiltonian and Roto-vibrational Spectrum. J Phys Chem A 2022; 126:691-709. [PMID: 35089047 DOI: 10.1021/acs.jpca.1c08912] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
For the first time, using three different electronic structure methodologies, namely, CASSCF, RS2c, and MRCI(SD), we construct ab initio adiabatic potential energy surfaces (APESs) and nonadiabatic coupling term (NACT) of two electronic states (5Eg) of MnO69- unit, where eight such units share one La atom in LaMnO3 crystal. While fitting those APESs with analytic functions of normal modes (Qx, Qy), an empirical scaling factor is introduced considering the mass ratio of eight MnO69- units with and without one La atom to explore the environmental (mass) effect on MnO69- unit. When the roto-vibrational levels of MnO69- Hamiltonian are calculated, peak positions computed from ab initio constructed excited APESs are found to be enough close with the experimental satellite transitions [ J. Exp. Theor. Phys. 2016, 122, 890-901] endorsing our earlier model results [ J. Chem. Phys. 2019, 150, 064703]. In order to explore the electron-nuclear coupling in an alternate way, theoretically "exact" and numerically "accurate" beyond Born-Oppenheimer (BBO) theory based diabatic potential energy surfaces (PESs) of MnO69- are constructed to generate the photoelectron (PE) spectra. The PE spectral band also exhibits good peak by peak correspondence with the higher satellite transitions in the dielectric function spectra of the LaMnO3 complex.
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Affiliation(s)
- Joy Dutta
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India
| | - Satyam Ravi
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India.,School of Advance Science and Languages, VIT Bhopal University, Bhopal-466114, India
| | - Soumya Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India
| | - Avik Kumar Ojha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India
| | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India
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5
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Zhao Y, Li Y, Chen C, Dong G, Zhu S, Zhao Y, Tian B, Jiang Z, Zhou Z, Shi K, Liu M, Pan J. Dislocation Defect Layer-Induced Magnetic Bi-states Phenomenon in Epitaxial La 0.7Sr 0.3MnO 3(111) Thin Films. ACS APPLIED MATERIALS & INTERFACES 2021; 13:59511-59517. [PMID: 34859661 DOI: 10.1021/acsami.1c18136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
La0.7Sr0.3MnO3 (LSMO) is one of the most fascinating strongly correlated oxides in which the spin polarization and magnetic property are sensitive to strain, especially in the (111)-oriented LSMO. In the paper, epitaxial LSMO(111) thin films with different thicknesses were prepared, and they showed continuous dislocation defect arrays with thickness greater than 45 nm. Then, the thick LSMO(111) films were divided into a double-layer structure with two slightly different oriented cells. The LSMO(111) films present a stronger lattice-spin coupling, thus the double-layer structure triggers an obvious magnetic heterogeneity phenomenon (magnetic bi-states) by the way of creating a double-mode ferromagnetic resonance (FMR) spectrum. Therefore, the nanostructures, especially the ordered structure defects, may trigger enriched physical phenomena and offer new forms of spin coupling and device functionality in strain-sensitive strongly correlated oxide systems.
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Affiliation(s)
- Yanan Zhao
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic and Information Engineering, State Key Laboratory for Mechanical Behavior of Materials, International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University (Yantai) Research Institute For Intelligent Sensing Technology and System, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yaojin Li
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic and Information Engineering, State Key Laboratory for Mechanical Behavior of Materials, International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University (Yantai) Research Institute For Intelligent Sensing Technology and System, Xi'an Jiaotong University, Xi'an 710049, China
| | - Chen Chen
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic and Information Engineering, State Key Laboratory for Mechanical Behavior of Materials, International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University (Yantai) Research Institute For Intelligent Sensing Technology and System, Xi'an Jiaotong University, Xi'an 710049, China
| | - Guohua Dong
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic and Information Engineering, State Key Laboratory for Mechanical Behavior of Materials, International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University (Yantai) Research Institute For Intelligent Sensing Technology and System, Xi'an Jiaotong University, Xi'an 710049, China
| | - Shukai Zhu
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic and Information Engineering, State Key Laboratory for Mechanical Behavior of Materials, International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University (Yantai) Research Institute For Intelligent Sensing Technology and System, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yifan Zhao
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic and Information Engineering, State Key Laboratory for Mechanical Behavior of Materials, International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University (Yantai) Research Institute For Intelligent Sensing Technology and System, Xi'an Jiaotong University, Xi'an 710049, China
| | - Bian Tian
- State Key Laboratory for Manufacturing Systems Engineering, Collaborative Innovation Center of High-End Manufacturing Equipment, the International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University, Xi'an 710049, China
| | - Zhuangde Jiang
- State Key Laboratory for Manufacturing Systems Engineering, Collaborative Innovation Center of High-End Manufacturing Equipment, the International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University, Xi'an 710049, China
| | - Ziyao Zhou
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic and Information Engineering, State Key Laboratory for Mechanical Behavior of Materials, International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University (Yantai) Research Institute For Intelligent Sensing Technology and System, Xi'an Jiaotong University, Xi'an 710049, China
| | - Keqing Shi
- Department of Intensive Care, Precision Medicine Center Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - Ming Liu
- Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, School of Electronic and Information Engineering, State Key Laboratory for Mechanical Behavior of Materials, International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University (Yantai) Research Institute For Intelligent Sensing Technology and System, Xi'an Jiaotong University, Xi'an 710049, China
| | - Jingye Pan
- Department of Intensive Care, Precision Medicine Center Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
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6
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Chi X, Guo R, Xiong J, Ren L, Peng X, Tay BK, Chen J. Enhanced Tunneling Magnetoresistance Effect via Ferroelectric Control of Interface Electronic/Magnetic Reconstructions. ACS APPLIED MATERIALS & INTERFACES 2021; 13:56638-56644. [PMID: 34786928 DOI: 10.1021/acsami.1c15836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Magnetic tunnel junctions (MTJs) with tunable tunneling magnetoresistances (TMR) have already been proven to have great potential for spintronics. Especially, when ferroelectric materials are used as insulating barriers, more novel functions of MTJs can be realized due to interface magnetoelectric coupling. Here, we demonstrate a very large ferroelectric modulation of TMR (as high as 570% in low-resistance state) in the ferroelectric/magnetic La0.5Sr0.5MnO3/BaTiO3 (LSMO/BTO) junctions and find robust interfacial electronic and magnetic reconstructions via ferroelectric polarization switching. Through electrical, magnetic, and optical measurements combined with X-ray absorption and magnetic circular dichroism, we reveal that the interfacial electronic and magnetic (ferromagnetic/antiferromagnetic phase transition) reconstructions originate from strong electromagnetic coupling between BTO and LSMO at the interface and are driven by the modulation of hole/electron doping at the interface of LSMO/BTO through ferroelectric polarization switching. As a result, the ferroelectrically controlled interface barrier height and width and spin filter effect enable a giant electrical modulation of TMR. Our results shed new light on the intrinsic mechanisms governing magnetoelectric coupling and offering a new route to enhance magnetoelectric coupling for spin control in spintronic devices.
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Affiliation(s)
- Xiao Chi
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510641, China
| | - Rui Guo
- Department of Materials Science and Engineering, National University of Singapore, 117575, Singapore
- Centre for Micro- and Nano-Electronics (CMNE), School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore
- UMI 3288 CINTRA (CNRS-NTU-THALES Research Alliances), Nanyang Technological University, Research Techno Plaza, 50 Nanyang Drive, 637553 Singapore
| | - Juxia Xiong
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, P.R. China
| | - Lizhu Ren
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117583 Singapore
| | - Xinwen Peng
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510641, China
| | - Beng Kang Tay
- Centre for Micro- and Nano-Electronics (CMNE), School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore
- UMI 3288 CINTRA (CNRS-NTU-THALES Research Alliances), Nanyang Technological University, Research Techno Plaza, 50 Nanyang Drive, 637553 Singapore
| | - Jingsheng Chen
- Department of Materials Science and Engineering, National University of Singapore, 117575, Singapore
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7
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Sun B, Zhou G, Sun L, Zhao H, Chen Y, Yang F, Zhao Y, Song Q. ABO 3 multiferroic perovskite materials for memristive memory and neuromorphic computing. NANOSCALE HORIZONS 2021; 6:939-970. [PMID: 34652346 DOI: 10.1039/d1nh00292a] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The unique electron spin, transfer, polarization and magnetoelectric coupling characteristics of ABO3 multiferroic perovskite materials make them promising candidates for application in multifunctional nanoelectronic devices. Reversible ferroelectric polarization, controllable defect concentration and domain wall movement originated from the ABO3 multiferroic perovskite materials promotes its memristive effect, which further highlights data storage, information processing and neuromorphic computing in diverse artificial intelligence applications. In particular, ion doping, electrode selection, and interface modulation have been demonstrated in ABO3-based memristive devices for ultrahigh data storage, ultrafast information processing, and efficient neuromorphic computing. These approaches presented today including controlling the dopant in the active layer, altering the oxygen vacancy distribution, modulating the diffusion depth of ions, and constructing the interface-dependent band structure were believed to be efficient methods for obtaining unique resistive switching (RS) behavior for various applications. In this review, internal physical dynamics, preparation technologies, and modulation methods are systemically examined as well as the progress, challenges, and possible solutions are proposed for next generation emerging ABO3-based memristive application in artificial intelligence.
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Affiliation(s)
- Bai Sun
- School of Physical Science and Technology, Key Laboratory of Advanced Technology of Materials (Ministry of Education of China), Southwest Jiaotong University, Chengdu, Sichuan 610031, China.
- Superconductivity and New Energy R&D Center, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Guangdong Zhou
- School of Artificial Intelligence and School of Materials and Energy, Southwest University, Chongqing 400715, China.
| | - Linfeng Sun
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Hongbin Zhao
- State Key Laboratory of Advanced Materials for Smart Sensing, General Research Institute for Nonferrous Metals, Beijing, 100088, China
| | - Yuanzheng Chen
- School of Physical Science and Technology, Key Laboratory of Advanced Technology of Materials (Ministry of Education of China), Southwest Jiaotong University, Chengdu, Sichuan 610031, China.
| | - Feng Yang
- Superconductivity and New Energy R&D Center, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Yong Zhao
- School of Physical Science and Technology, Key Laboratory of Advanced Technology of Materials (Ministry of Education of China), Southwest Jiaotong University, Chengdu, Sichuan 610031, China.
- Superconductivity and New Energy R&D Center, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Qunliang Song
- School of Artificial Intelligence and School of Materials and Energy, Southwest University, Chongqing 400715, China.
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8
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Yoo MW, Tornos J, Sander A, Lin LF, Mohanta N, Peralta A, Sanchez-Manzano D, Gallego F, Haskel D, Freeland JW, Keavney DJ, Choi Y, Strempfer J, Wang X, Cabero M, Vasili HB, Valvidares M, Sanchez-Santolino G, Gonzalez-Calbet JM, Rivera A, Leon C, Rosenkranz S, Bibes M, Barthelemy A, Anane A, Dagotto E, Okamoto S, te Velthuis SGE, Santamaria J, Villegas JE. Large intrinsic anomalous Hall effect in SrIrO 3 induced by magnetic proximity effect. Nat Commun 2021; 12:3283. [PMID: 34078889 PMCID: PMC8172877 DOI: 10.1038/s41467-021-23489-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 04/25/2021] [Indexed: 02/04/2023] Open
Abstract
The anomalous Hall effect (AHE) is an intriguing transport phenomenon occurring typically in ferromagnets as a consequence of broken time reversal symmetry and spin-orbit interaction. It can be caused by two microscopically distinct mechanisms, namely, by skew or side-jump scattering due to chiral features of the disorder scattering, or by an intrinsic contribution directly linked to the topological properties of the Bloch states. Here we show that the AHE can be artificially engineered in materials in which it is originally absent by combining the effects of symmetry breaking, spin orbit interaction and proximity-induced magnetism. In particular, we find a strikingly large AHE that emerges at the interface between a ferromagnetic manganite (La0.7Sr0.3MnO3) and a semimetallic iridate (SrIrO3). It is intrinsic and originates in the proximity-induced magnetism present in the narrow bands of strong spin-orbit coupling material SrIrO3, which yields values of anomalous Hall conductivity and Hall angle as high as those observed in bulk transition-metal ferromagnets. These results demonstrate the interplay between correlated electron physics and topological phenomena at interfaces between 3d ferromagnets and strong spin-orbit coupling 5d oxides and trace an exciting path towards future topological spintronics at oxide interfaces.
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Affiliation(s)
- Myoung-Woo Yoo
- grid.460789.40000 0004 4910 6535Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
| | - J. Tornos
- grid.4795.f0000 0001 2157 7667GFMC, Dept. Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain
| | - A. Sander
- grid.460789.40000 0004 4910 6535Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
| | - Ling-Fang Lin
- grid.411461.70000 0001 2315 1184Department of Physics and Astronomy, University of Tennessee, Knoxville, TN USA ,grid.263826.b0000 0004 1761 0489School of Physics, Southeast University, Nanjing, China
| | - Narayan Mohanta
- grid.135519.a0000 0004 0446 2659Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN USA
| | - A. Peralta
- grid.4795.f0000 0001 2157 7667GFMC, Dept. Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain
| | - D. Sanchez-Manzano
- grid.4795.f0000 0001 2157 7667GFMC, Dept. Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain
| | - F. Gallego
- grid.4795.f0000 0001 2157 7667GFMC, Dept. Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain
| | - D. Haskel
- grid.187073.a0000 0001 1939 4845Advanced Photon Source Argonne National Laboratory, Lemont, IL USA
| | - J. W. Freeland
- grid.187073.a0000 0001 1939 4845Advanced Photon Source Argonne National Laboratory, Lemont, IL USA
| | - D. J. Keavney
- grid.187073.a0000 0001 1939 4845Advanced Photon Source Argonne National Laboratory, Lemont, IL USA
| | - Y. Choi
- grid.187073.a0000 0001 1939 4845Advanced Photon Source Argonne National Laboratory, Lemont, IL USA
| | - J. Strempfer
- grid.187073.a0000 0001 1939 4845Advanced Photon Source Argonne National Laboratory, Lemont, IL USA
| | - X. Wang
- grid.253355.70000 0001 2192 5641Department of Physics, Bryn Mawr College, Bryn Mawr, PA USA
| | - M. Cabero
- grid.5515.40000000119578126IMDEA Nanoscience Campus Universidad Autonoma, Cantoblanco, Spain ,grid.4795.f0000 0001 2157 7667Centro Nacional de Microscopia Electronica, Universidad Complutense, Madrid, Spain
| | - Hari Babu Vasili
- grid.423639.9CELLS-ALBA Synchrotron Radiation Facility, Cerdanyola del Valles, Spain
| | - Manuel Valvidares
- grid.423639.9CELLS-ALBA Synchrotron Radiation Facility, Cerdanyola del Valles, Spain
| | - G. Sanchez-Santolino
- grid.4795.f0000 0001 2157 7667GFMC, Dept. Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain
| | - J. M. Gonzalez-Calbet
- grid.4795.f0000 0001 2157 7667Centro Nacional de Microscopia Electronica, Universidad Complutense, Madrid, Spain ,grid.4795.f0000 0001 2157 7667Department Quimica Inorganica, Facultad de Quimica, Universidad Complutense, Madrid, Spain
| | - A. Rivera
- grid.4795.f0000 0001 2157 7667GFMC, Dept. Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain
| | - C. Leon
- grid.4795.f0000 0001 2157 7667GFMC, Dept. Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain
| | - S. Rosenkranz
- grid.187073.a0000 0001 1939 4845Materials Science Division, Argonne National Laboratory, Lemont, IL USA
| | - M. Bibes
- grid.460789.40000 0004 4910 6535Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
| | - A. Barthelemy
- grid.460789.40000 0004 4910 6535Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
| | - A. Anane
- grid.460789.40000 0004 4910 6535Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
| | - Elbio Dagotto
- grid.411461.70000 0001 2315 1184Department of Physics and Astronomy, University of Tennessee, Knoxville, TN USA ,grid.135519.a0000 0004 0446 2659Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN USA
| | - S. Okamoto
- grid.135519.a0000 0004 0446 2659Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN USA
| | - S. G. E. te Velthuis
- grid.187073.a0000 0001 1939 4845Materials Science Division, Argonne National Laboratory, Lemont, IL USA
| | - J. Santamaria
- grid.4795.f0000 0001 2157 7667GFMC, Dept. Fisica de Materiales, Facultad de Fisica, Universidad Complutense, Madrid, Spain
| | - Javier E. Villegas
- grid.460789.40000 0004 4910 6535Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
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9
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Sasabe N, Kimata M, Nakamura T. Presence of X-Ray Magnetic Circular Dichroism Signal for Zero-Magnetization Antiferromagnetic State. PHYSICAL REVIEW LETTERS 2021; 126:157402. [PMID: 33929244 DOI: 10.1103/physrevlett.126.157402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 02/12/2021] [Accepted: 02/19/2021] [Indexed: 06/12/2023]
Abstract
X-ray magnetic circular dichroism (XMCD) is generally not observed for antiferromagnetic (AFM) states because XMCD signals from the antiparallelly coupled spins cancel each other. In this Letter, we theoretically show the presence of an XMCD signal from compensated two-dimensional triangle AFM structures on a Kagome lattice. The calculation reveals the complete correspondence between the XMCD spectra and the sign of the spin chirality: the XMCD signal only appears when the spin chirality is negative. This XMCD signal originates from the different absorption coefficients of the three sublattices reflecting different charge density anisotropies and directions of spin and orbital magnetic moments.
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Affiliation(s)
- Norimasa Sasabe
- Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan
| | - Motoi Kimata
- Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan
| | - Tetsuya Nakamura
- Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan
- Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan
- International Center for Synchrotron Radiation Innovation Smart, Tohoku University, Sendai, Miyagi 980-8577, Japan
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10
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Zhang L, Zheng D, Fan L, Wang J, Kim M, Wang J, Wang H, Xing X, Tian J, Chen J. Controllable Ferromagnetism in Super-tetragonal PbTiO 3 through Strain Engineering. NANO LETTERS 2020; 20:881-886. [PMID: 31887059 DOI: 10.1021/acs.nanolett.9b03472] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The coupling strain in nanoscale systems can achieve control of the physical properties in functional materials, such as ferromagnets, ferroelectrics, and superconductors. Here, we directly demonstrate the atomic-scale structure of super-tetragonal PbTiO3 nanocomposite epitaxial thin films, including the extraordinary coupling of strain transition and the existence of the oxygen vacancies. Large strain gradients, both longitudinal and transverse (∼3 × 107 m-1), have been observed. The original non-magnetic ferroelectric composites notably evoke ferromagnetic properties, derived from the combination of Ti3+ and oxygen vacancies. The saturation ferromagnetic moment can be controlled by the strain of both the interphase and substrate, optimized to a high value of ∼55 emu/cc in 10-nm thick nanocomposite epitaxial thin films on the LaAlO3 substrate. Strain engineering provides a route to explore multiferroic systems in conventional non-magnetic ferroelectric oxides and to create functional data storage devices from both ferroelectrics and ferromagnetics.
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Affiliation(s)
- Linxing Zhang
- Institute for Advanced Materials and Technology , University of Science and Technology Beijing , Beijing 100083 , China
| | - Dongxing Zheng
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Processing Technology, School of Science , Tianjin University , Tianjin 300350 , China
| | - Longlong Fan
- College of Physics and Materials Science , Tianjin Normal University , Tianjin 300387 , China
| | - Jinguo Wang
- Department of Materials Science and Engineering , University of Texas at Dallas , Richardson , Texas 75080 , United States
| | - Moon Kim
- Department of Materials Science and Engineering , University of Texas at Dallas , Richardson , Texas 75080 , United States
| | - Jiaou Wang
- Institute of High Energy Physics , Chinese Academy of Sciences , Beijing 100049 , China
| | - Huanhua Wang
- Institute of High Energy Physics , Chinese Academy of Sciences , Beijing 100049 , China
| | - Xianran Xing
- Beijing Advanced Innovation Center for Materials Genome Engineering, Department of Physical Chemistry , University of Science and Technology Beijing , Beijing 100083 , China
| | - Jianjun Tian
- Institute for Advanced Materials and Technology , University of Science and Technology Beijing , Beijing 100083 , China
| | - Jun Chen
- School of Mathematics and Physics , University of Science and Technology Beijing , Beijing 100083 , China
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11
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Carreira SJ, Aguirre MH, Briatico J, Steren LB. Nanoscale magnetic and charge anisotropies at manganite interfaces. RSC Adv 2019; 9:38604-38611. [PMID: 35540222 PMCID: PMC9075869 DOI: 10.1039/c9ra06552k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 11/06/2019] [Indexed: 11/23/2022] Open
Abstract
Strong correlated manganites are still under intense research owing to their complex phase diagrams in terms of Sr-doping and their sensitivity to intrinsic and extrinsic structural deformations. Here, we performed X-ray absorption spectroscopy measurements of manganite bilayers to explore the effects that a local Sr-doping gradient produce on the charge and antiferromagnetic anisotropies. In order to gradually tune the Sr-doping level along the axis perpendicular to the samples we have grown a series of bilayers with different thicknesses of low-doped manganites (from 0 nm to 6 nm) deposited over a La0.7Sr0.3MnO3 metallic layer. This strategy permitted us to resolve with high accuracy the thickness region where the charge and spin anisotropies vary and the critical thickness tc over which the out of plane orbital asymmetry does not have any further modifications. We found that the antiferromagnetic spin axis points preferentially out of the sample plane regardless the capping layer thickness. However, it tilts partially into the sample plane far from this critical thickness, owing to the combined contributions of the external structural strain and electron doping. Furthermore, we found that the doping level of the capping layer strongly affects the critical thickness, giving clear evidence of the influence exerted by the electron doping on the orbital and magnetic configurations. These anisotropic changes induce subtle modifications on the domain reorientation of La0.7Sr0.3MnO3, as evidenced from the magnetic hysteresis cycles. Nanoscale variation of antiferromagnetic and charge anisotropies has been found at manganite interfaces with an artificially created Sr-doping.![]()
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Affiliation(s)
- Santiago J Carreira
- Consejo Nacional de Investigaciones Científicas y Técnicas Argentina +54-11-6772-7103.,Laboratorio de Nanoestructuras Magnéticas y Dispositivos, Dpto. Materia Condensada, Instituto de Nanociencia y Nanotecnología (INN), Centro Atómico Constituyentes (CNEA) 1650 San Martín Buenos Aires Argentina
| | - Myriam H Aguirre
- Instituto de Ciencia de Materiales de Aragón (ICMA), Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza E-50018 Zaragoza Spain +34 976 76 2776 +34 876 55 5365.,Departamento de Física de la Materia Condensada, Universidad de Zaragoza E-50009 Zaragoza Spain.,Laboratorio de Microscopías Avanzadas, Universidad de Zaragoza E-50018 Zaragoza Spain
| | - Javier Briatico
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Sud, Université Paris-Saclay Palaiseau 91767 France
| | - Laura B Steren
- Consejo Nacional de Investigaciones Científicas y Técnicas Argentina +54-11-6772-7103.,Laboratorio de Nanoestructuras Magnéticas y Dispositivos, Dpto. Materia Condensada, Instituto de Nanociencia y Nanotecnología (INN), Centro Atómico Constituyentes (CNEA) 1650 San Martín Buenos Aires Argentina
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12
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Cui D, Gu M, Li C, Duan H, Yan W, Wang P, Li A, Wu D. Interface electron transfer and thickness dependent transport characteristics of La 0.7Sr 0.3VO 3 thin films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:245002. [PMID: 30865938 DOI: 10.1088/1361-648x/ab0f68] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
La0.7Sr0.3VO3 (LSVO) thin films, 5-30 unit cells (u.c.) in thickness, have been epitaxially deposited on (0 0 1) SrTiO3 (STO) single crystal substrates. Although LSVO is metallic in bulk, insulating behavior is observed, from 2 to 390 K, in LSVO films less than 9 u.c. in thickness, while thicker films show a metal-insulator transition with the critical temperature increasing with the decrease of film thickness. X-ray absorption spectra reveal a charge transfer across the LSVO/STO interface for a continuous increase of V valence in LSVO, as well as a decrease of Ti valence in interfacial STO, with the LSVO film thickness increases. The transport characteristics are discussed in terms of enhanced electron localization due to the reduction of film thickness and V 3d band filling induced by the charge transfer.
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Affiliation(s)
- Dapeng Cui
- National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering and Jiangsu Key Laboratory for Artificial Functional Materials, Nanjing University, Nanjing, Jiangsu 210093, People's Republic of China
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13
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Wang H, Chi X, Liu Z, Yoong H, Tao L, Xiao J, Guo R, Wang J, Dong Z, Yang P, Sun CJ, Li C, Yan X, Wang J, Chow GM, Tsymbal EY, Tian H, Chen J. Atomic-Scale Control of Magnetism at the Titanite-Manganite Interfaces. NANO LETTERS 2019; 19:3057-3065. [PMID: 30964306 DOI: 10.1021/acs.nanolett.9b00441] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Complex oxide thin-film heterostructures often exhibit magnetic properties different from those known for bulk constituents. This is due to the altered local structural and electronic environment at the interfaces, which affects the exchange coupling and magnetic ordering. The emergent magnetism at oxide interfaces can be controlled by ferroelectric polarization and has a strong effect on spin-dependent transport properties of oxide heterostructures, including magnetic and ferroelectric tunnel junctions. Here, using prototype La2/3Sr1/3MnO3/BaTiO3 heterostructures, we demonstrate that ferroelectric polarization of BaTiO3 controls the orbital hybridization and magnetism at heterointerfaces. We observe changes in the enhanced orbital occupancy and significant charge redistribution across the heterointerfaces, affecting the spin and orbital magnetic moments of the interfacial Mn and Ti atoms. Importantly, we find that the exchange coupling between Mn and Ti atoms across the interface is tuned by ferroelectric polarization from ferromagnetic to antiferromagnetic. Our findings provide a viable route to electrically control complex magnetic configurations at artificial multiferroic interfaces, taking a step toward low-power spintronics.
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Affiliation(s)
- Han Wang
- Department of Materials Science and Engineering , National University of Singapore , 117575 Singapore
| | - Xiao Chi
- Department of Physics , National University of Singapore , 2 Science Drive 3 , 117542 Singapore
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 117603 Singapore
| | - ZhongRan Liu
- Center of Electron Microscope, State Key Laboratory of Silicon Materials, School of Materials Science and Engineering , Zhejiang University , Hangzhou 310027 , China
| | - HerngYau Yoong
- Department of Materials Science and Engineering , National University of Singapore , 117575 Singapore
| | - LingLing Tao
- Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience , University of Nebraska , Lincoln , Nebraska 68588-0299 , United States
| | - JuanXiu Xiao
- Department of Materials Science and Engineering , National University of Singapore , 117575 Singapore
| | - Rui Guo
- Department of Materials Science and Engineering , National University of Singapore , 117575 Singapore
| | - JingXian Wang
- School of Materials Science and Engineering , Nanyang Technological University , 639798 Singapore
| | - ZhiLi Dong
- School of Materials Science and Engineering , Nanyang Technological University , 639798 Singapore
| | - Ping Yang
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 117603 Singapore
| | - Cheng-Jun Sun
- Advanced Photon Source , Argonne National Laboratory , Argonne , Illinois 60439 , United States
| | - ChangJian Li
- Department of Materials Science and Engineering , National University of Singapore , 117575 Singapore
| | - XiaoBing Yan
- College of Electron and Information Engineering , Hebei University , Baoding 071002 , China
| | - John Wang
- Department of Materials Science and Engineering , National University of Singapore , 117575 Singapore
| | - Gan Moog Chow
- Department of Materials Science and Engineering , National University of Singapore , 117575 Singapore
| | - Evgeny Y Tsymbal
- Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience , University of Nebraska , Lincoln , Nebraska 68588-0299 , United States
| | - He Tian
- Center of Electron Microscope, State Key Laboratory of Silicon Materials, School of Materials Science and Engineering , Zhejiang University , Hangzhou 310027 , China
| | - Jingsheng Chen
- Department of Materials Science and Engineering , National University of Singapore , 117575 Singapore
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14
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Wang L, Stoerzinger KA, Chang L, Yin X, Li Y, Tang CS, Jia E, Bowden ME, Yang Z, Abdelsamie A, You L, Guo R, Chen J, Rusydi A, Wang J, Chambers SA, Du Y. Strain Effect on Oxygen Evolution Reaction Activity of Epitaxial NdNiO 3 Thin Films. ACS APPLIED MATERIALS & INTERFACES 2019; 11:12941-12947. [PMID: 30834739 DOI: 10.1021/acsami.8b21301] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Epitaxial strain can cause both lattice distortion and oxygen nonstoichiometry, effects that are strongly coupled at heterojunctions of complex nickelate oxides. Here we decouple these structural and chemical effects on the oxygen evolution reaction (OER) by using a set of coherently strained epitaxial NdNiO3 films. We show that within the regime where oxygen vacancies (VO) are negligible, compressive strain is favorable for the OER whereas tensile strain is unfavorable; the former induces orbital splitting, resulting in a higher occupancy in the d3 z2- r2 orbital and weaker Ni-O chemisorption. However, when the tensile strain is sufficiently large to promote VO formation, an increase in the OER is also observed. The partial reduction of Ni3+ to Ni2+ due to VO makes the eg occupancy slightly larger than unity, which is thought to account for the increased OER activity. Our work highlights that epitaxial-strain-induced lattice distortion and VO generation can be individually or collectively exploited to tune OER activity, which is important for the predictive synthesis of high-performance electrocatalysts.
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Affiliation(s)
- Le Wang
- School of Materials Science and Engineering , Nanyang Technological University , Singapore 639798 , Singapore
| | - Kelsey A Stoerzinger
- School of Chemical, Biological, and Environmental Engineering , Oregon State University , Corvallis , Oregon 97331 , United States
| | - Lei Chang
- School of Materials Science and Engineering , Nanyang Technological University , Singapore 639798 , Singapore
| | - Xinmao Yin
- Department of Physics, Faculty of Science , National University of Singapore , Singapore 117542 , Singapore
| | - Yangyang Li
- Department of Material Science & Engineering , National University of Singapore , Singapore 117575 , Singapore
| | - Chi Sin Tang
- NUS Graduate School for Integrative Sciences and Engineering , National University of Singapore , Singapore 117456 , Singapore
| | - Endong Jia
- The Key Laboratory of Solar Thermal Energy and Photovoltaic System, Institute of Electrical Engineering , Chinese Academy of Science , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100190 , China
| | | | | | - Amr Abdelsamie
- School of Materials Science and Engineering , Nanyang Technological University , Singapore 639798 , Singapore
| | - Lu You
- School of Materials Science and Engineering , Nanyang Technological University , Singapore 639798 , Singapore
| | - Rui Guo
- Department of Material Science & Engineering , National University of Singapore , Singapore 117575 , Singapore
| | - Jingsheng Chen
- Department of Material Science & Engineering , National University of Singapore , Singapore 117575 , Singapore
| | - Andrivo Rusydi
- Department of Physics, Faculty of Science , National University of Singapore , Singapore 117542 , Singapore
| | - Junling Wang
- School of Materials Science and Engineering , Nanyang Technological University , Singapore 639798 , Singapore
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15
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Strain effect on orbital and magnetic structures of Mn ions in epitaxial Nd 0.35Sr 0.65MnO 3/SrTiO 3 films using X-ray diffraction and absorption. Sci Rep 2019; 9:5160. [PMID: 30914713 PMCID: PMC6435741 DOI: 10.1038/s41598-019-41433-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 03/08/2019] [Indexed: 11/08/2022] Open
Abstract
This study probes the temperature-dependent strain that is strongly correlated with the orbital and magnetic structures of epitaxial films of Nd0.35Sr0.65MnO3 (NSMO) that are fabricated by pulsed laser deposition with two thicknesses, 17 (NS17) and 103 nm (NS103) on SrTiO3 (STO) substrate. This investigation is probed using X-ray diffraction (XRD) and absorption-based techniques, X-ray linear dichroism (XLD) and the X-ray magnetic circular dichroism (XMCD). XRD indicates a significant shift in the (004) peak position that is associated with larger strain in NS17 relative to that of NS103 at both 30 and 300 K. Experimental and atomic multiplet simulated temperature-dependent Mn L3,2-edge XLD results reveal that the stronger strain in a thinner NS17 film causes less splitting of Mn 3d eg state at low temperature, indicating an enhancement of orbital fluctuations in the band above the Fermi level. This greater Mn 3d orbital fluctuation can be the cause of both the enhanced ferromagnetism (FM) as a result of spin moments and the reduced Néel temperature of C-type antiferromagnetism (AFM) in NS17, leading to the FM coupling of the canted-antiferromagnetism (FM-cAFM) state in NSMO/STO epitaxial films at low temperature (T = 30 K). These findings are also confirmed by Mn L3,2-edge XMCD measurements.
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16
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Tornos J, Gallego F, Valencia S, Liu YH, Rouco V, Lauter V, Abrudan R, Luo C, Ryll H, Wang Q, Hernandez-Martin D, Orfila G, Cabero M, Cuellar F, Arias D, Mompean FJ, Garcia-Hernandez M, Radu F, Charlton TR, Rivera-Calzada A, Sefrioui Z, Te Velthuis SGE, Leon C, Santamaria J. Ferroelectric Control of Interface Spin Filtering in Multiferroic Tunnel Junctions. PHYSICAL REVIEW LETTERS 2019; 122:037601. [PMID: 30735408 DOI: 10.1103/physrevlett.122.037601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 07/27/2018] [Indexed: 06/09/2023]
Abstract
The electronic reconstruction occurring at oxide interfaces may be the source of interesting device concepts for future oxide electronics. Among oxide devices, multiferroic tunnel junctions are being actively investigated as they offer the possibility to modulate the junction current by independently controlling the switching of the magnetization of the electrodes and of the ferroelectric polarization of the barrier. In this Letter, we show that the spin reconstruction at the interfaces of a La_{0.7}Sr_{0.3}MnO_{3}/BaTiO_{3}/La_{0.7}Sr_{0.3}MnO_{3} multiferroic tunnel junction is the origin of a spin filtering functionality that can be turned on and off by reversing the ferroelectric polarization. The ferroelectrically controlled interface spin filter enables a giant electrical modulation of the tunneling magnetoresistance between values of 10% and 1000%, which could inspire device concepts in oxides-based low dissipation spintronics.
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Affiliation(s)
- J Tornos
- GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - F Gallego
- GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - S Valencia
- Hemholtz-Zentrum Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - Y H Liu
- Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, Tennessee 37831, USA
- Argonne National Laboratory, Materials Science Division, Argonne, Illinois 60439, USA
| | - V Rouco
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - V Lauter
- Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, Tennessee 37831, USA
| | - R Abrudan
- Hemholtz-Zentrum Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
- Institut für Experimentalphysik (Festkörperphysik), Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - C Luo
- Hemholtz-Zentrum Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
- University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany
| | - H Ryll
- Hemholtz-Zentrum Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - Q Wang
- Argonne National Laboratory, Materials Science Division, Argonne, Illinois 60439, USA
| | | | - G Orfila
- GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - M Cabero
- GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - F Cuellar
- GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - D Arias
- GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - F J Mompean
- 2D-Foundry Group, Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, 28049 Madrid, Spain
- Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, 28049 Madrid, Spain
| | - M Garcia-Hernandez
- 2D-Foundry Group, Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, 28049 Madrid, Spain
- Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, 28049 Madrid, Spain
| | - F Radu
- Hemholtz-Zentrum Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - T R Charlton
- ISIS, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, United Kingdom
| | - A Rivera-Calzada
- GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain
- Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, 28049 Madrid, Spain
| | - Z Sefrioui
- GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain
- Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, 28049 Madrid, Spain
- GFMC, Instituto de Magnetismo Aplicado, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - S G E Te Velthuis
- Argonne National Laboratory, Materials Science Division, Argonne, Illinois 60439, USA
| | - C Leon
- GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain
- Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, 28049 Madrid, Spain
- GFMC, Instituto de Magnetismo Aplicado, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - J Santamaria
- GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain
- Laboratorio de Heteroestructuras con aplicación en spintrónica, Unidad Asociada UCM/CSIC, 28049 Madrid, Spain
- GFMC, Instituto de Magnetismo Aplicado, Universidad Complutense de Madrid, 28040 Madrid, Spain
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17
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Yan C, Wang T. A new view for nanoparticle assemblies: from crystalline to binary cooperative complementarity. Chem Soc Rev 2018; 46:1483-1509. [PMID: 28059420 DOI: 10.1039/c6cs00696e] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Studies on nanoparticle assemblies and their applications have been research frontiers in nanoscience in the past few decades and remarkable progress has been made in the synthetic strategies and techniques. Recently, the design and fabrication of the nanoparticle-based nanomaterials or nanodevices with integrated and enhanced properties compared to those of the individual components have gradually become the mainstream. However, a systematic solution to provide a big picture for future development and guide the investigation of different aspects of the study of nanoparticle assemblies remains a challenge. The binary cooperative complementary principle could be an answer. The binary cooperative complementary principle is a universal discipline and can describe the fundamental properties of matter from the subatomic particles to the universe. According to its definition, a variety of nanoparticle assemblies, which represent the cutting-edge work in the nanoparticle studies, are naturally binary cooperative complementary materials. Therefore, the introduction of the binary cooperative complementary principle in the studies of nanoparticle assemblies could provide a unique perspective for reviewing this field and help in the design and fabrication of novel functional nanoparticle assemblies.
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Affiliation(s)
- Cong Yan
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Tie Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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18
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Prajapat CL, Singh S, Bhattacharya D, Ravikumar G, Basu S, Mattauch S, Zheng JG, Aoki T, Paul A. Proximity effects across oxide-interfaces of superconductor-insulator-ferromagnet hybrid heterostructure. Sci Rep 2018; 8:3732. [PMID: 29487317 PMCID: PMC5829237 DOI: 10.1038/s41598-018-22036-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 02/15/2018] [Indexed: 11/24/2022] Open
Abstract
A case study of electron tunneling or charge-transfer-driven orbital ordering in superconductor (SC)-ferromagnet (FM) interfaces has been conducted in heteroepitaxial YBa2Cu3O7(YBCO)/La0.67Sr0.33MnO3(LSMO) multilayers interleaved with and without an insulating SrTiO3(STO) layer between YBCO and LSMO. X-ray magnetic circular dichroism experiments revealed anti-parallel alignment of Mn magnetic moments and induced Cu magnetic moments in a YBCO/LSMO multilayer. As compared to an isolated LSMO layer, the YBCO/LSMO multilayer displayed a (50%) weaker Mn magnetic signal, which is related to the usual proximity effect. It was a surprise that a similar proximity effect was also observed in a YBCO/STO/LSMO multilayer, however, the Mn signal was reduced by 20%. This reduced magnetic moment of Mn was further verified by depth sensitive polarized neutron reflectivity. Electron energy loss spectroscopy experiment showed the evidence of Ti magnetic polarization at the interfaces of the YBCO/STO/LSMO multilayer. This crossover magnetization is due to a transfer of interface electrons that migrate from Ti(4+)−δ to Mn at the STO/LSMO interface and to Cu2+ at the STO/YBCO interface, with hybridization via O 2p orbitals. So charge-transfer driven orbital ordering is the mechanism responsible for the observed proximity effect and Mn-Cu anti-parallel coupling in YBCO/STO/LSMO. This work provides an effective pathway in understanding the aspect of long range proximity effect and consequent orbital degeneracy parameter in magnetic coupling.
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Affiliation(s)
- C L Prajapat
- Technical Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Surendra Singh
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.,Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400085, India
| | - D Bhattacharya
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - G Ravikumar
- Technical Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - S Basu
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.,Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400085, India
| | - S Mattauch
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstraße 1, D-85747, Garching b. München, Germany
| | - Jian-Guo Zheng
- Irvine Materials Research Institute, University of California, Irvine, CA, 92697-2800, USA
| | - T Aoki
- Irvine Materials Research Institute, University of California, Irvine, CA, 92697-2800, USA
| | - Amitesh Paul
- Technische Universität München, Physik Department E21, Lehrstuhl für Neutronenstreuung, James-Franck-Straße 1, D-85748, Garching, Germany.
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19
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Zhou G, Jiang F, Zang J, Quan Z, Xu X. Observation of Superconductivity in the LaNiO 3/La 0.7Sr 0.3MnO 3 Superlattice. ACS APPLIED MATERIALS & INTERFACES 2018; 10:1463-1467. [PMID: 29286234 DOI: 10.1021/acsami.7b17603] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In the pursuit of high-temperature superconductivity like that in cuprates, artificial heterostructures or interfaces have attracted tremendous interest. It has been a long-sought goal to find similar unconventional superconductivity in nickelates. However, as far as we know, this has not yet been experimentally realized. To approach this objective, we synthesized a prototypical superlattice that consists of ultrathin LaNiO3 and La0.7Sr0.3MnO3 layers. Both zero resistance and the Meissner effect are observed using resistive and magnetic measurements of the superlattice. These are experimental indicators for superconductivity in new superconductors. X-ray linear dichroism causes the NiO2 planes to develop electron-occupied x2-y2 orbital order similar to that of cuprate-based superconductors. Our findings demonstrate that artificial interface engineering is suitable for investigating novel physical phenomena, such as superconductivity.
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Affiliation(s)
- Guowei Zhou
- School of Chemistry and Materials Science, Key Laboratory of Magnetic Molecules and Magnetic Information Materials, Ministry of Education, Shanxi Normal University , Linfen 041004, China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology , Linfen 041004, China
| | - Fengxian Jiang
- School of Chemistry and Materials Science, Key Laboratory of Magnetic Molecules and Magnetic Information Materials, Ministry of Education, Shanxi Normal University , Linfen 041004, China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology , Linfen 041004, China
| | - Julu Zang
- School of Chemistry and Materials Science, Key Laboratory of Magnetic Molecules and Magnetic Information Materials, Ministry of Education, Shanxi Normal University , Linfen 041004, China
| | - Zhiyong Quan
- School of Chemistry and Materials Science, Key Laboratory of Magnetic Molecules and Magnetic Information Materials, Ministry of Education, Shanxi Normal University , Linfen 041004, China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology , Linfen 041004, China
| | - Xiaohong Xu
- School of Chemistry and Materials Science, Key Laboratory of Magnetic Molecules and Magnetic Information Materials, Ministry of Education, Shanxi Normal University , Linfen 041004, China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology , Linfen 041004, China
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20
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Iqbal AM, Jaffari GH, Saleemi M, Ceylan A. Relaxation dynamics and polydispersivity associated with defects and ferroelectric correlations in Ba-doped EuTiO 3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:465402. [PMID: 29053467 DOI: 10.1088/1361-648x/aa8b95] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present the frequency- and temperature-dependent dielectric response of Eu1-x Ba x TiO3 (0 ⩽ x ⩽ 0.5) in detail. Excluding grain boundary effects, four relaxation mechanisms were observed. Relaxation dynamics were observed to arise due to hopping conduction associated with defects, namely oxygen vacancies as well as Eu3+ and Ti3+ ions. Dielectric relaxation analysis led to the identification of Ti ions in two different environments with different relaxation rates in the overall EuTiO3 perovskite structure. The emergence of another relaxation mechanism associated with ferroelectric order as a consequence of the formation of polar regions was also observed for higher Ba concentrations. The addition of Ba led to the identification of relaxation dynamics associated with hopping conduction between Eu ions, Ti ions (in the regions with and without oxygen vacancies) and with the formation of ferroelectric polar regions. Furthermore, the polydispersivity and relaxation times were extracted within the framework of the modified Debye model. Relaxation times have been observed to increase with a decrease in temperature while larger values of polydispersivity reveal a wide distribution of relaxation times due to the presence of lattice parameter and energy barrier distributions.
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Affiliation(s)
- Asad M Iqbal
- Department of Physics, Quaid-i-Azam University, Islamabad, Pakistan
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21
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Zhou G, Yan Z, Bai Y, Zang J, Quan Z, Qi S, Xu X. Exchange Bias Effect and Orbital Reconstruction in (001)-Oriented LaMnO 3/LaNiO 3 Superlattices. ACS APPLIED MATERIALS & INTERFACES 2017; 9:39855-39862. [PMID: 29057645 DOI: 10.1021/acsami.7b14503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Paramagnetic LaNiO3 (LNO)-based heterostructures have been attracting the attention of researches, especially since the interesting exchange bias (EB) effect has been observed in (111)-oriented LaMnO3 (LMO)/LNO superlattices (SLs). However, this effect is not expected to occur in the (001) direction SLs. In this paper, we report the observation of an unexpected EB effect in (001)-oriented (LMO)3/(LNO)t SLs. The orbits of interfacial Mn/Ni ions preferentially occupy the strain-stabilized x2 - y2 in ultrathin LNO layers [t ≤ 4 unit cells (u.c.)]. Conversely, as the LNO layer becomes thicker (t ≥ 6 u.c.), the EB effect is absent, and the orbits are reconstructed to form the 3z2 - r2 preferential occupancy. The absence of the EB in thicker LNO-based SLs is attributed to the interfacial charge transfer suppressed by orbital reconstruction as a consequence of the increasing LNO thickness. In the thinner LNO-based SLs, the larger charge transfer results in stronger localized magnetic moments for the cause of the EB effect. These results provide a useful interpretation of the relationship between macroscopic magnetic properties and the microscopic electronic structure in oxide-based heterostructures.
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Affiliation(s)
- Guowei Zhou
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004, China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology , Linfen 041004, China
| | - Zhi Yan
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004, China
| | - Yuhao Bai
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology , Linfen 041004, China
| | - Julu Zang
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004, China
| | - Zhiyong Quan
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004, China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology , Linfen 041004, China
| | - Shifei Qi
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004, China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology , Linfen 041004, China
| | - Xiaohong Xu
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004, China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology , Linfen 041004, China
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22
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Chen Y, Green RJ, Sutarto R, He F, Linderoth S, Sawatzky GA, Pryds N. Tuning the Two-Dimensional Electron Liquid at Oxide Interfaces by Buffer-Layer-Engineered Redox Reactions. NANO LETTERS 2017; 17:7062-7066. [PMID: 29053919 DOI: 10.1021/acs.nanolett.7b03744] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Polar discontinuities and redox reactions provide alternative paths to create two-dimensional electron liquids (2DELs) at oxide interfaces. Herein, we report high mobility 2DELs at interfaces involving SrTiO3 (STO) achieved using polar La7/8Sr1/8MnO3 (LSMO) buffer layers to manipulate both polarities and redox reactions from disordered overlayers grown at room temperature. Using resonant X-ray reflectometry experiments, we quantify redox reactions from oxide overlayers on STO as well as polarity induced electronic reconstruction at epitaxial LSMO/STO interfaces. The analysis reveals how these effects can be combined in a STO/LSMO/disordered film trilayer system to yield high mobility modulation doped 2DELs, where the buffer layer undergoes a partial transformation from perovskite to brownmillerite structure. This uncovered interplay between polar discontinuities and redox reactions via buffer layers provides a new approach for the design of functional oxide interfaces.
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Affiliation(s)
- Yunzhong Chen
- Department of Energy Conversion and Storage, Technical University of Denmark , Risø campus, 4000 Roskilde, Denmark
| | - Robert J Green
- Stewart Blusson Quantum Matter Institute, Department of Physics and Astronomy, University of British Columbia , Vancouver, British Columbia V6T 1Z4, Canada
- Max Planck Institute for Chemical Physics of Solids , Nothnitzerstraβe 40, 01187 Dresden, Germany
| | - Ronny Sutarto
- Canadian Light Source , Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Feizhou He
- Canadian Light Source , Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Søren Linderoth
- Department of Energy Conversion and Storage, Technical University of Denmark , Risø campus, 4000 Roskilde, Denmark
| | - George A Sawatzky
- Stewart Blusson Quantum Matter Institute, Department of Physics and Astronomy, University of British Columbia , Vancouver, British Columbia V6T 1Z4, Canada
| | - Nini Pryds
- Department of Energy Conversion and Storage, Technical University of Denmark , Risø campus, 4000 Roskilde, Denmark
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23
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Yi D, Flint CL, Balakrishnan PP, Mahalingam K, Urwin B, Vailionis A, N'Diaye AT, Shafer P, Arenholz E, Choi Y, Stone KH, Chu JH, Howe BM, Liu J, Fisher IR, Suzuki Y. Tuning Perpendicular Magnetic Anisotropy by Oxygen Octahedral Rotations in (La_{1-x}Sr_{x}MnO_{3})/(SrIrO_{3}) Superlattices. PHYSICAL REVIEW LETTERS 2017; 119:077201. [PMID: 28949659 DOI: 10.1103/physrevlett.119.077201] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Indexed: 06/07/2023]
Abstract
Perpendicular magnetic anisotropy (PMA) plays a critical role in the development of spintronics, thereby demanding new strategies to control PMA. Here we demonstrate a conceptually new type of interface induced PMA that is controlled by oxygen octahedral rotation. In superlattices comprised of La_{1-x}Sr_{x}MnO_{3} and SrIrO_{3}, we find that all superlattices (0≤x≤1) exhibit ferromagnetism despite the fact that La_{1-x}Sr_{x}MnO_{3} is antiferromagnetic for x>0.5. PMA as high as 4×10^{6} erg/cm^{3} is observed by increasing x and attributed to a decrease of oxygen octahedral rotation at interfaces. We also demonstrate that oxygen octahedral deformation cannot explain the trend in PMA. These results reveal a new degree of freedom to control PMA, enabling discovery of emergent magnetic textures and topological phenomena.
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Affiliation(s)
- Di Yi
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
- Department of Applied Physics, Stanford University, Stanford, California 94305, USA
| | - Charles L Flint
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
- Department of MSE, Stanford University, Stanford, California 94305, USA
| | - Purnima P Balakrishnan
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
- Department of Physics, Stanford University, Stanford, California 94305, USA
| | - Krishnamurthy Mahalingam
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA
| | - Brittany Urwin
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA
| | - Arturas Vailionis
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
| | - Alpha T N'Diaye
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Padraic Shafer
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Elke Arenholz
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Yongseong Choi
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Kevin H Stone
- SSRL, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Jiun-Haw Chu
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
- Department of Applied Physics, Stanford University, Stanford, California 94305, USA
- SIMES, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Brandon M Howe
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA
| | - Jian Liu
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Ian R Fisher
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
- Department of Applied Physics, Stanford University, Stanford, California 94305, USA
- SIMES, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Yuri Suzuki
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
- Department of Applied Physics, Stanford University, Stanford, California 94305, USA
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24
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Li X, Lindfors-Vrejoiu I, Ziese M, Gloter A, van Aken PA. Impact of interfacial coupling of oxygen octahedra on ferromagnetic order in La 0.7Sr 0.3MnO 3/SrTiO 3 heterostructures. Sci Rep 2017; 7:40068. [PMID: 28074836 PMCID: PMC5225431 DOI: 10.1038/srep40068] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 11/30/2016] [Indexed: 11/09/2022] Open
Abstract
La0.7Sr0.3MnO3, a half-metallic ferromagnet with full spin polarization, is generally used as a standard spin injector in heterostructures. However, the magnetism of La0.7Sr0.3MnO3 is strongly modified near interfaces, which was addressed as "dead-layer" phenomenon whose origin is still controversial. Here, both magnetic and structural properties of La0.7Sr0.3MnO3/SrTiO3 heterostructures were investigated, with emphasis on the quantitative analysis of oxygen octahedral rotation (OOR) across interfaces using annular-bright-field imaging. OOR was found to be significantly altered near interface for both La0.7Sr0.3MnO3 and SrTiO3, as linked to the magnetism deterioration. Especially in La0.7Sr0.3MnO3/SrTiO3 superlattices, the almost complete suppression of OOR in 4 unit-cell-thick La0.7Sr0.3MnO3 results in a canted ferromagnetism. Detailed comparisons between strain and OOR relaxation and especially the observation of an unexpected La0.7Sr0.3MnO3 lattice c expansion near interfaces, prove the relevance of OOR for the magnetic properties. These results indicate the capability of tuning the magnetism by engineering OOR at the atomic scale.
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Affiliation(s)
- Xiaoyan Li
- Stuttgart Center for Electron Microscopy, Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany.,Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris Sud, 91405 Orsay, France
| | | | - Michael Ziese
- Universität Leipzig, Fakultät für Physik und Geowissenschaften, Abteilung Supraleitung und Magnetismus, Linnéstrasse 5, D-04103 Leipzig, Germany
| | - Alexandre Gloter
- Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris Sud, 91405 Orsay, France
| | - Peter A van Aken
- Stuttgart Center for Electron Microscopy, Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
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25
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Li J, Yin D, Li Q, Sun R, Huang S, Meng F. Interfacial defects induced electronic property transformation at perovskite SrVO3/SrTiO3 and LaCrO3/SrTiO3 heterointerfaces. Phys Chem Chem Phys 2017; 19:6945-6951. [DOI: 10.1039/c6cp07691b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unravelling the atomic structure and chemical species of interfacial defects is critical to understanding the origin of interfacial properties in many heterojunctions.
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Affiliation(s)
- Junjie Li
- Engineering Research Center for Nanophotonics and Advanced Instrument
- Ministry of Education
- Department of Physics
- East China Normal University
- Shanghai 200062
| | - Deqiang Yin
- School of Manufacturing Science and Engineering
- Sichuan University
- Chengdu 610064
- China
| | - Qiang Li
- School of Mechanical Engineering
- University of Shanghai for Science and Technology
- Shanghai 200093
- China
| | - Rong Sun
- Institute of Engineering Innovation
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Sumei Huang
- Engineering Research Center for Nanophotonics and Advanced Instrument
- Ministry of Education
- Department of Physics
- East China Normal University
- Shanghai 200062
| | - Fanzhi Meng
- School of Materials Science and Engineering
- Changchun University of Science and Technology
- Changchun 130022
- China
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26
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Emergent nanoscale superparamagnetism at oxide interfaces. Nat Commun 2016; 7:12566. [PMID: 27558907 PMCID: PMC5007328 DOI: 10.1038/ncomms12566] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 07/14/2016] [Indexed: 11/12/2022] Open
Abstract
Atomically sharp oxide heterostructures exhibit a range of novel physical phenomena that are absent in the parent compounds. A prominent example is the appearance of highly conducting and superconducting states at the interface between LaAlO3 and SrTiO3. Here we report an emergent phenomenon at the LaMnO3/SrTiO3 interface where an antiferromagnetic Mott insulator abruptly transforms into a nanoscale inhomogeneous magnetic state. Upon increasing the thickness of LaMnO3, our scanning nanoSQUID-on-tip microscopy shows spontaneous formation of isolated magnetic nanoislands, which display thermally activated moment reversals in response to an in-plane magnetic field. The observed superparamagnetic state manifests the emergence of thermodynamic electronic phase separation in which metallic ferromagnetic islands nucleate in an insulating antiferromagnetic matrix. We derive a model that captures the sharp onset and the thickness dependence of the magnetization. Our model suggests that a nearby superparamagnetic–ferromagnetic transition can be gate tuned, holding potential for applications in magnetic storage and spintronics. Interfaces between complex oxides can exhibit diverse emergent phenomena, such as magnetic and superconducting order. Here, the authors evidence the emergence of nanoislands with a thickness dependent transition from superparamagnetic to ferromagnetic behaviour at LaMnO3/SrTiO3 thin film interfaces.
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27
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Stornaiuolo D, Cantoni C, De Luca GM, Di Capua R, Di Gennaro E, Ghiringhelli G, Jouault B, Marrè D, Massarotti D, Miletto Granozio F, Pallecchi I, Piamonteze C, Rusponi S, Tafuri F, Salluzzo M. Tunable spin polarization and superconductivity in engineered oxide interfaces. NATURE MATERIALS 2016; 15:278-283. [PMID: 26641020 DOI: 10.1038/nmat4491] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Accepted: 10/16/2015] [Indexed: 06/05/2023]
Abstract
Advances in growth technology of oxide materials allow single atomic layer control of heterostructures. In particular delta doping, a key materials' engineering tool in today's semiconductor technology, is now also available for oxides. Here we show that a fully electric-field-tunable spin-polarized and superconducting quasi-2D electron system (q2DES) can be artificially created by inserting a few unit cells of delta doping EuTiO3 at the interface between LaAlO3 and SrTiO3 oxides. Spin polarization emerges below the ferromagnetic transition temperature of the EuTiO3 layer (TFM = 6-8 K) and is due to the exchange interaction between the magnetic moments of Eu-4f and of Ti-3d electrons. Moreover, in a large region of the phase diagram, superconductivity sets in from a ferromagnetic normal state. The occurrence of magnetic interactions, superconductivity and spin-orbit coupling in the same q2DES makes the LaAlO3/EuTiO3/SrTiO3 system an intriguing platform for the emergence of novel quantum phases in low-dimensional materials.
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Affiliation(s)
- D Stornaiuolo
- Dipartimento di Fisica, Università di Napoli "Federico II", Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - C Cantoni
- Materials Science and Technology Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, USA
| | - G M De Luca
- Dipartimento di Fisica, Università di Napoli "Federico II", Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - R Di Capua
- Dipartimento di Fisica, Università di Napoli "Federico II", Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - E Di Gennaro
- Dipartimento di Fisica, Università di Napoli "Federico II", Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - G Ghiringhelli
- CNR-SPIN and Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - B Jouault
- Laboratoire Charles Coulomb, UMR 5221, CNRS, Université Montpellier 2, F-34095 Montpellier, France
| | - D Marrè
- CNR-SPIN and Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, I-14146 Genova, Italy
| | - D Massarotti
- Dipartimento di Fisica, Università di Napoli "Federico II", Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - F Miletto Granozio
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
| | - I Pallecchi
- CNR-SPIN and Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, I-14146 Genova, Italy
| | - C Piamonteze
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - S Rusponi
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - F Tafuri
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
- Dipartimento di Ingegneria dell'Informazione, Seconda Università degli Studi di Napoli (SUN), 81031 Aversa (CE), Italy
| | - M Salluzzo
- CNR-SPIN, Complesso Monte Sant'Angelo via Cinthia, I-80126 Napoli, Italy
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28
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Cao Y, Yang Z, Kareev M, Liu X, Meyers D, Middey S, Choudhury D, Shafer P, Guo J, Freeland JW, Arenholz E, Gu L, Chakhalian J. Magnetic Interactions at the Nanoscale in Trilayer Titanates. PHYSICAL REVIEW LETTERS 2016; 116:076802. [PMID: 26943550 DOI: 10.1103/physrevlett.116.076802] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Indexed: 06/05/2023]
Abstract
We report on the phase diagram of competing magnetic interactions at the nanoscale in engineered ultrathin trilayer heterostructures of LaTiO_{3}/SrTiO_{3}/YTiO_{3}, in which the interfacial inversion symmetry is explicitly broken. Combined atomic layer resolved scanning transmission electron microscopy with electron energy loss spectroscopy and electrical transport have confirmed the formation of a spatially separated two-dimensional electron liquid and high density two-dimensional localized magnetic moments at the LaTiO_{3}/SrTiO_{3} and SrTiO_{3}/YTiO_{3} interfaces, respectively. Resonant soft x-ray linear dichroism spectroscopy has demonstrated the presence of orbital polarization of the conductive LaTiO_{3}/SrTiO_{3} and localized SrTiO_{3}/YTiO_{3} electrons. Our results provide a route with prospects for exploring new magnetic interfaces, designing a tunable two-dimensional d-electron Kondo lattice, and potential spin Hall applications.
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Affiliation(s)
- Yanwei Cao
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
| | - Zhenzhong Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - M Kareev
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
| | - Xiaoran Liu
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
| | - D Meyers
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
| | - S Middey
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
| | - D Choudhury
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
- Department of Physics, Indian Institute of Technology, Kharagpur 721302, India
| | - P Shafer
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Jiandong Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Collaborative Innovation Center of Quantum Matter, Beijing 100190, People's Republic of China
| | - J W Freeland
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - E Arenholz
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Lin Gu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Collaborative Innovation Center of Quantum Matter, Beijing 100190, People's Republic of China
| | - J Chakhalian
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
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29
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Cui B, Song C, Mao H, Wu H, Li F, Peng J, Wang G, Zeng F, Pan F. Magnetoelectric Coupling Induced by Interfacial Orbital Reconstruction. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:6651-6. [PMID: 26413768 DOI: 10.1002/adma.201503115] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2015] [Revised: 07/28/2015] [Indexed: 05/28/2023]
Abstract
Reversible orbital reconstruction driven by ferroelectric polarization modulates the magnetic performance of model ferroelectric/ferromagnetic heterostructures without onerous limitations. Mn-d(x2-y2) orbital occupancy and related interfacial exotic magnetic states are enhanced and weakened by negative and positive electric fields, respectively, filling the missing member-orbital in the mechanism of magnetoelectric coupling and advancing the application of orbitals to microelectronics.
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Affiliation(s)
- Bin Cui
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Cheng Song
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Haijun Mao
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Huaqiang Wu
- Institute of Microelectronics, Tsinghua University, Beijing, 100084, China
| | - Fan Li
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Jingjing Peng
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Guangyue Wang
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Fei Zeng
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Feng Pan
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
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30
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Liu Y, Ke X. Interfacial magnetism in complex oxide heterostructures probed by neutrons and x-rays. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:373003. [PMID: 26328474 DOI: 10.1088/0953-8984/27/37/373003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Magnetic complex-oxide heterostructures are of keen interest because a wealth of phenomena at the interface of dissimilar materials can give rise to fundamentally new physics and potentially valuable functionalities. Altered magnetization, novel magnetic coupling and emergent interfacial magnetism at the epitaxial layered-oxide interfaces are under intensive investigation, which shapes our understanding on how to utilize those materials, particularly for spintronics. Neutron and x-ray based techniques have played a decisive role in characterizing interfacial magnetic structures and clarifying the underlying physics in this rapidly developing field. Here we review some recent experimental results, with an emphasis on those studied via polarized neutron reflectometery and polarized x-ray absorption spectroscopy. We conclude with some perspectives.
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Affiliation(s)
- Yaohua Liu
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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31
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Jilili J, Cossu F, Schwingenschlögl U. Trends in (LaMnO3)n/(SrTiO3)m superlattices with varying layer thicknesses. Sci Rep 2015; 5:13762. [PMID: 26323361 PMCID: PMC4555181 DOI: 10.1038/srep13762] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 08/04/2015] [Indexed: 11/09/2022] Open
Abstract
We investigate the thickness dependence of the structural, electronic, and magnetic properties of (LaMnO3)n/(SrTiO3)m (n, m = 2, 4, 6, 8) superlattices using density functional theory. The electronic structure turns out to be highly sensitive to the onsite Coulomb interaction. In contrast to bulk SrTiO3, strongly distorted O octahedra are observed in the SrTiO3 layers with a systematic off centering of the Ti atoms. The systems favour ferromagnetic spin ordering rather than the antiferromagnetic spin ordering of bulk LaMnO3 and all show half-metallicity, while a systematic reduction of the minority spin band gaps as a function of the LaMnO3 and SrTiO3 layer thicknesses originates from modifications of the Ti dxy states.
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Affiliation(s)
- J Jilili
- KAUST, PSE Division, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - F Cossu
- KAUST, PSE Division, Thuwal 23955-6900, Kingdom of Saudi Arabia
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32
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Feng N, Mi W, Wang X, Cheng Y, Schwingenschlögl U. Superior Properties of Energetically Stable La(2/3)Sr(1/3)MnO(3)/Tetragonal BiFeO3 Multiferroic Superlattices. ACS APPLIED MATERIALS & INTERFACES 2015; 7:10612-10616. [PMID: 25928202 DOI: 10.1021/acsami.5b02436] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The superlattice of energetically stable La2/3Sr1/3MnO3 and tetragonal BiFeO3 is investigated by means of density functional theory. The superlattice as a whole exhibits a half-metallic character, as is desired for spintronic devices. The interfacial electronic states and exchange coupling are analyzed in details. We demonstrate that the interfacial O atoms play a key role in controlling the coupling. The higher ferroelectricity of tetragonal BiFeO3 and stronger response to the magnetic moments in the La2/3Sr1/3MnO3/BiFeO3 superlattice show a strongly enhanced electric control of the magnetism as compared to the rhombohedral one. Therefore, it is particularly practical interest in the magnetoelectrically controlled spintronic devices.
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Affiliation(s)
- Nan Feng
- †Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Faculty of Science, Tianjin University, Tianjin 300072, China
| | - Wenbo Mi
- †Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Faculty of Science, Tianjin University, Tianjin 300072, China
| | | | - Yingchun Cheng
- §Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
- ∥PSE Division, KAUST, Thuwal 23955-6900, Kingdom of Saudi Arabia
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33
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Vaz CAF, Walker FJ, Ahn CH, Ismail-Beigi S. Intrinsic interfacial phenomena in manganite heterostructures. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:123001. [PMID: 25721578 DOI: 10.1088/0953-8984/27/12/123001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We review recent advances in our understanding of interfacial phenomena that emerge when dissimilar materials are brought together at atomically sharp and coherent interfaces. In particular, we focus on phenomena that are intrinsic to the interface and review recent work carried out on perovskite manganites interfaces, a class of complex oxides whose rich electronic properties have proven to be a useful playground for the discovery and prediction of novel phenomena.
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Affiliation(s)
- C A F Vaz
- Swiss Light Source, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
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34
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Su B, Guo W, Jiang L. Learning from nature: binary cooperative complementary nanomaterials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:1072-96. [PMID: 25074551 DOI: 10.1002/smll.201401307] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Indexed: 05/16/2023]
Abstract
In this Review, nature-inspired binary cooperative complementary nanomaterials (BCCNMs), consisting of two components with entirely opposite physiochemical properties at the nanoscale, are presented as a novel concept for the building of promising materials. Once the distance between the two nanoscopic components is comparable to the characteristic length of some physical interactions, the cooperation between these complementary building blocks becomes dominant and endows the macroscopic materials with novel and superior properties. The first implementation of the BCCNMs is the design of bio-inspired smart materials with superwettability and their reversible switching between different wetting states in response to various kinds of external stimuli. Coincidentally, recent studies on other types of functional nanomaterials contribute more examples to support the idea of BCCNMs, which suggests a potential yet comprehensive range of future applications in both materials science and engineering.
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Affiliation(s)
- Bin Su
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
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35
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Bruno FY, Grisolia MN, Visani C, Valencia S, Varela M, Abrudan R, Tornos J, Rivera-Calzada A, Ünal AA, Pennycook SJ, Sefrioui Z, Leon C, Villegas JE, Santamaria J, Barthélémy A, Bibes M. Insight into spin transport in oxide heterostructures from interface-resolved magnetic mapping. Nat Commun 2015; 6:6306. [PMID: 25686532 DOI: 10.1038/ncomms7306] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Accepted: 01/15/2015] [Indexed: 11/09/2022] Open
Abstract
At interfaces between complex oxides, electronic, orbital and magnetic reconstructions may produce states of matter absent from the materials involved, offering novel possibilities for electronic and spintronic devices. Here we show that magnetic reconstruction has a strong influence on the interfacial spin selectivity, a key parameter controlling spin transport in magnetic tunnel junctions. In epitaxial heterostructures combining layers of antiferromagnetic LaFeO(3) (LFO) and ferromagnetic La(0.7)Sr(0.3)MnO(3) (LSMO), we find that a net magnetic moment is induced in the first few unit planes of LFO near the interface with LSMO. Using X-ray photoemission electron microscopy, we show that the ferromagnetic domain structure of the manganite electrodes is imprinted into the antiferromagnetic tunnel barrier, endowing it with spin selectivity. Finally, we find that the spin arrangement resulting from coexisting ferromagnetic and antiferromagnetic interactions strongly influences the tunnel magnetoresistance of LSMO/LFO/LSMO junctions through competing spin-polarization and spin-filtering effects.
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Affiliation(s)
- F Y Bruno
- Unité Mixte de Physique CNRS/Thales, 1 Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France
| | - M N Grisolia
- Unité Mixte de Physique CNRS/Thales, 1 Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France
| | - C Visani
- Unité Mixte de Physique CNRS/Thales, 1 Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France
| | - S Valencia
- Helmholtz-Zentrum-Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - M Varela
- 1] GFMC, Departamento Física Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada CSIC/Universidad Complutense de Madrid, Sor Juana Inés de la Cruz, 3, 28049 Madrid, Spain [3] Materials Science &Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R Abrudan
- 1] Helmholtz-Zentrum-Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany [2] Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - J Tornos
- 1] GFMC, Departamento Física Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada CSIC/Universidad Complutense de Madrid, Sor Juana Inés de la Cruz, 3, 28049 Madrid, Spain
| | - A Rivera-Calzada
- 1] GFMC, Departamento Física Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada CSIC/Universidad Complutense de Madrid, Sor Juana Inés de la Cruz, 3, 28049 Madrid, Spain
| | - A A Ünal
- Helmholtz-Zentrum-Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
| | - S J Pennycook
- Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Z Sefrioui
- 1] GFMC, Departamento Física Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada CSIC/Universidad Complutense de Madrid, Sor Juana Inés de la Cruz, 3, 28049 Madrid, Spain
| | - C Leon
- 1] GFMC, Departamento Física Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada CSIC/Universidad Complutense de Madrid, Sor Juana Inés de la Cruz, 3, 28049 Madrid, Spain
| | - J E Villegas
- Unité Mixte de Physique CNRS/Thales, 1 Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France
| | - J Santamaria
- 1] GFMC, Departamento Física Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada CSIC/Universidad Complutense de Madrid, Sor Juana Inés de la Cruz, 3, 28049 Madrid, Spain
| | - A Barthélémy
- Unité Mixte de Physique CNRS/Thales, 1 Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France
| | - M Bibes
- Unité Mixte de Physique CNRS/Thales, 1 Avenue A. Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France
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36
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Nemes NM, Calderón MJ, Beltrán JI, Bruno FY, García-Barriocanal J, Sefrioui Z, León C, García-Hernández M, Muñoz MC, Brey L, Santamaría J. Signatures of a two-dimensional ferromagnetic electron gas at the La0.7Sr0.3MnO3/SrTiO3 interface arising from orbital reconstruction. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:7516-7520. [PMID: 25327446 DOI: 10.1002/adma.201402829] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 08/29/2014] [Indexed: 06/04/2023]
Abstract
The magnetoresistance of La0.7Sr0.3MnO3/SrTiO3 superlattices with magnetic field rotating out-of-plane shows unexpected peaks for in-plane fields. Resistivity calculations with spin-orbit coupling reveal that orbital reconstruction at the manganite interface leads to a 2D ferromagnetic electron gas coupled antiparallel to the manganite "bulk". These orbital and magnetic reconstructions are supported by X-ray linear dichroism and ab initio calculations.
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Affiliation(s)
- Norbert Marcel Nemes
- GFMC, Departamento de Física Aplicada III, Universidad Complutense de Madrid, Campus Moncloa, E-28040, Madrid, Spain; Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada Consejo Superior de Investigaciones Científicas/Universidad Complutense Madrid, Sor Juana Inés de la Cruz, 3, E-28049, Madrid, Spain
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37
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Zhai X, Cheng L, Liu Y, Schlepütz CM, Dong S, Li H, Zhang X, Chu S, Zheng L, Zhang J, Zhao A, Hong H, Bhattacharya A, Eckstein JN, Zeng C. Correlating interfacial octahedral rotations with magnetism in (LaMnO3+δ)N/(SrTiO3)N superlattices. Nat Commun 2014; 5:4283. [PMID: 25005724 DOI: 10.1038/ncomms5283] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Accepted: 06/03/2014] [Indexed: 11/10/2022] Open
Abstract
Lattice distortion due to oxygen octahedral rotations have a significant role in mediating the magnetism in oxides, and recently attracts a lot of interests in the study of complex oxides interface. However, the direct experimental evidence for the interrelation between octahedral rotation and magnetism at interface is scarce. Here we demonstrate that interfacial octahedral rotation are closely linked to the strongly modified ferromagnetism in (LaMnO3+δ)N/(SrTiO3)N superlattices. The maximized ferromagnetic moment in the N=6 superlattice is accompanied by a metastable structure (space group Imcm) featuring minimal octahedral rotations (a(-)a(-)c(-), α~4.2°, γ~0.5°). Quenched ferromagnetism for N<4 superlattices is correlated to a substantially enhanced c axis octahedral rotation (a(-)a(-)c(-), α~3.8°, γ~8° for N=2). Monte-Carlo simulation based on double-exchange model qualitatively reproduces the experimental observation, confirming the correlation between octahedral rotation and magnetism. Our study demonstrates that engineering superlattices with controllable interfacial structures can be a feasible new route in realizing functional magnetic materials.
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Affiliation(s)
- Xiaofang Zhai
- 1] Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Long Cheng
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yang Liu
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | | | - Shuai Dong
- Department of Physics, Southeast University, Nanjing 211189, China
| | - Hui Li
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiaoqiang Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Shengqi Chu
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Lirong Zheng
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Zhang
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Aidi Zhao
- 1] Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Hawoong Hong
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Anand Bhattacharya
- Materials Science Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - James N Eckstein
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Changgan Zeng
- 1] Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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38
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Cuellar FA, Liu YH, Salafranca J, Nemes N, Iborra E, Sanchez-Santolino G, Varela M, Garcia Hernandez M, Freeland JW, Zhernenkov M, Fitzsimmons MR, Okamoto S, Pennycook SJ, Bibes M, Barthélémy A, te Velthuis SGE, Sefrioui Z, Leon C, Santamaria J. Reversible electric-field control of magnetization at oxide interfaces. Nat Commun 2014; 5:4215. [PMID: 24953219 DOI: 10.1038/ncomms5215] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 05/27/2014] [Indexed: 11/09/2022] Open
Abstract
Electric-field control of magnetism has remained a major challenge which would greatly impact data storage technology. Although progress in this direction has been recently achieved, reversible magnetization switching by an electric field requires the assistance of a bias magnetic field. Here we take advantage of the novel electronic phenomena emerging at interfaces between correlated oxides and demonstrate reversible, voltage-driven magnetization switching without magnetic field. Sandwiching a non-superconducting cuprate between two manganese oxide layers, we find a novel form of magnetoelectric coupling arising from the orbital reconstruction at the interface between interfacial Mn spins and localized states in the CuO2 planes. This results in a ferromagnetic coupling between the manganite layers that can be controlled by a voltage. Consequently, magnetic tunnel junctions can be electrically toggled between two magnetization states, and the corresponding spin-dependent resistance states, in the absence of a magnetic field.
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Affiliation(s)
- F A Cuellar
- 1] GFMC, Departamento Fisica Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2]
| | - Y H Liu
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J Salafranca
- 1] GFMC, Departamento Fisica Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N Nemes
- GFMC, Departamento Fisica Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain
| | - E Iborra
- GMME Departamento de Tecnologia Electronica, ETSIT, Universidad Politecnica de Madrid, 28040 Madrid, Spain
| | - G Sanchez-Santolino
- 1] GFMC, Departamento Fisica Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada CSIC/Universidad Complutense Madrid, Sor Juana Inés de la Cruz, 3, ES-28049 Madrid, Spain
| | - M Varela
- 1] GFMC, Departamento Fisica Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M Garcia Hernandez
- 1] Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada CSIC/Universidad Complutense Madrid, Sor Juana Inés de la Cruz, 3, ES-28049 Madrid, Spain [2] Instituto de Ciencia de Materiales de Madrid, 28049 Madrid, Spain
| | - J W Freeland
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Zhernenkov
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - M R Fitzsimmons
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - S Okamoto
- Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S J Pennycook
- Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Bibes
- 1] Unité Mixte de Physique CNRS/Thales, 1 avenue Augustin Fresnel, Campus de l'Ecole Polytechnique, 91767 Palaiseau, France [2] Université Paris-Sud, 91905 Orsay, France
| | - A Barthélémy
- 1] Unité Mixte de Physique CNRS/Thales, 1 avenue Augustin Fresnel, Campus de l'Ecole Polytechnique, 91767 Palaiseau, France [2] Université Paris-Sud, 91905 Orsay, France
| | - S G E te Velthuis
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Z Sefrioui
- 1] GFMC, Departamento Fisica Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada CSIC/Universidad Complutense Madrid, Sor Juana Inés de la Cruz, 3, ES-28049 Madrid, Spain
| | - C Leon
- 1] GFMC, Departamento Fisica Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada CSIC/Universidad Complutense Madrid, Sor Juana Inés de la Cruz, 3, ES-28049 Madrid, Spain
| | - J Santamaria
- 1] GFMC, Departamento Fisica Aplicada III, Universidad Complutense Madrid, 28040 Madrid, Spain [2] Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada CSIC/Universidad Complutense Madrid, Sor Juana Inés de la Cruz, 3, ES-28049 Madrid, Spain
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Mundy JA, Hikita Y, Hidaka T, Yajima T, Higuchi T, Hwang HY, Muller DA, Kourkoutis LF. Visualizing the interfacial evolution from charge compensation to metallic screening across the manganite metal-insulator transition. Nat Commun 2014; 5:3464. [PMID: 24632721 DOI: 10.1038/ncomms4464] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Accepted: 02/18/2014] [Indexed: 11/09/2022] Open
Abstract
Electronic changes at polar interfaces between transition metal oxides offer the tantalizing possibility to stabilize novel ground states yet can also cause unintended reconstructions in devices. The nature of these interfacial reconstructions should be qualitatively different for metallic and insulating films as the electrostatic boundary conditions and compensation mechanisms are distinct. Here we directly quantify with atomic-resolution the charge distribution for manganite-titanate interfaces traversing the metal-insulator transition. By measuring the concentration and valence of the cations, we find an intrinsic interfacial electronic reconstruction in the insulating films. The total charge observed for the insulating manganite films quantitatively agrees with that needed to cancel the polar catastrophe. As the manganite becomes metallic with increased hole doping, the total charge build-up and its spatial range drop substantially. Direct quantification of the intrinsic charge transfer and spatial width should lay the framework for devices harnessing these unique electronic phases.
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Affiliation(s)
- Julia A Mundy
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA
| | - Yasuyuki Hikita
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Takeaki Hidaka
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Takeaki Yajima
- 1] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Takuya Higuchi
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Harold Y Hwang
- 1] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA [2] Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, California 94305, USA
| | - David A Muller
- 1] School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA [2] Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA
| | - Lena F Kourkoutis
- 1] School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA [2] Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA
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40
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Feng N, Mi W, Wang X, Bai H. The magnetism of Fe4N/oxides (MgO, BaTiO3, BiFeO3) interfaces from first-principles calculations. RSC Adv 2014. [DOI: 10.1039/c4ra06763k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
n- and p-type doping of MgO are induced in contact with FeIFeII and (FeII)2N terminations of Fe4N, respectively. The metallic characteristics are induced in BaTiO3 by contact with FeIFeII termination, whereas p- and n-type doping appears in (FeII)2N/BaO and (FeII)2N/TiO2 interfaces, respectively. The interfacial dipole due to charge rearrangement may induce the Fermi level pinning in Fe4N/MgO and (FeII)2N/BaTiO3 interfaces. The deposition of Fe4N on BiFeO3 can result in a metallic BiFeO3.
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Affiliation(s)
- Nan Feng
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology
- Faculty of Science
- Tianjin University
- Tianjin 300072, China
| | - Wenbo Mi
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology
- Faculty of Science
- Tianjin University
- Tianjin 300072, China
| | - Xiaocha Wang
- Tianjin Key Laboratory of Film Electronic & Communicate Devices
- School of Electronics Information Engineering
- Tianjin University of Technology
- Tianjin 300384, China
| | - Haili Bai
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology
- Faculty of Science
- Tianjin University
- Tianjin 300072, China
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41
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Chen H, Millis AJ, Marianetti CA. Engineering correlation effects via artificially designed oxide superlattices. PHYSICAL REVIEW LETTERS 2013; 111:116403. [PMID: 24074110 DOI: 10.1103/physrevlett.111.116403] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Indexed: 06/02/2023]
Abstract
Ab initio calculations are used to predict that a superlattice composed of layers of LaTiO3 and LaNiO3 alternating along the [001] direction is a S=1 Mott insulator with large magnetic moments on the Ni sites, negligible moments on the Ti sites and a charge transfer gap set by the energy difference between Ni d and Ti d states, distinct from conventional Mott insulators. Correlation effects are enhanced on the Ni sites via filling the oxygen p states and reducing the Ni-O-Ni bond angle. Small hole (electron) doping of the superlattice leads to a two-dimensional single-band situation with holes (electrons) residing on the Ni d(x2-y2) (Ti d(xy)) orbital and coupled to antiferromagnetically correlated spins in the NiO2 layer.
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Affiliation(s)
- Hanghui Chen
- Department of Physics, Columbia University, New York, New York 10027, USA and Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA
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42
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Petrov AY, Torrelles X, Verna A, Xu H, Cossaro A, Pedio M, Garcia-Barriocanal J, Castro GR, Davidson BA. Surface octahedral distortions and atomic design of perovskite interfaces. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:4043-4048. [PMID: 23813784 DOI: 10.1002/adma.201301841] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Indexed: 06/02/2023]
Abstract
Atomic engineering of perovskite films and interfaces is significantly improved by in situ optimization of reflection high-energy electron diffraction (RHEED) features resulting from surface BO₆ octahedral rotations seen during molecular-beam epitaxy growth. This approach yields Sr-doped manganite films across the phase diagram with magnetotransport properties that are, for the first time, identical to bulk single crystals. Careful structural analysis of manganite/titanate interfaces shows that cation intermixing and unit cell dilations are eliminated, while BO₆ rotations and Jahn-Teller-type elongations are nearly completely suppressed at the interface.
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Affiliation(s)
- A Yu Petrov
- CNR-IOM TASC National Laboratory, Area Science Park-Basovizza, 34149 Trieste, Italy
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43
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Bruno FY, Schmidt R, Varela M, Garcia-Barriocanal J, Rivera-Calzada A, Cuellar FA, Leon C, Thakur P, Cezar JC, Brookes NB, Garcia-Hernandez M, Dagotto E, Pennycook SJ, Santamaria J. Electron doping by charge transfer at LaFeO3/Sm2CuO4 epitaxial interfaces. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:1468-1473. [PMID: 23292988 DOI: 10.1002/adma.201203483] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Revised: 10/23/2012] [Indexed: 06/01/2023]
Abstract
Using X-ray absorption spectroscopy and electron energy loss spectroscopy with atomic-scale spatial resolution, experimental evidence for charge transfer at the interface between the Mott insulators Sm2 CuO4 and LaFeO3 is obtained. As a consequence of the charge transfer, the Sm2 CuO4 is doped with electrons and thus epitaxial Sm2 CuO4 /LaFeO3 heterostructures become metallic.
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Affiliation(s)
- Flavio Y Bruno
- GFMC, Departamento Física Aplicada III, Universidad Complutense de Madrid, Campus Moncloa, Madrid, Spain.
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44
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Wang BY, Wang HT, Singh SB, Shao YC, Wang YF, Chuang CH, Yeh PH, Chiou JW, Pao CW, Tsai HM, Lin HJ, Lee JF, Tsai CY, Hsieh WF, Tsai MH, Pong WF. Effect of geometry on the magnetic properties of CoFe2O4–PbTiO3 multiferroic composites. RSC Adv 2013. [DOI: 10.1039/c3ra00104k] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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45
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Rusydi A, Dhar S, Barman AR, Qi DC, Motapothula M, Yi JB, Santoso I, Feng YP, Yang K, Dai Y, Yakovlev NL, Ding J, Wee ATS, Neuber G, Breese MBH, Ruebhausen M, Hilgenkamp H, Venkatesan T. Cationic-vacancy-induced room-temperature ferromagnetism in transparent, conducting anatase Ti1-xTaxO2 (x~0.05) thin films. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2012; 370:4927-4943. [PMID: 22987036 DOI: 10.1098/rsta.2012.0198] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report room-temperature ferromagnetism (FM) in highly conducting, transparent anatase Ti(1-x)Ta(x)O(2) (x∼0.05) thin films grown by pulsed laser deposition on LaAlO(3) substrates. Rutherford backscattering spectrometry (RBS), X-ray diffraction, proton-induced X-ray emission, X-ray absorption spectroscopy (XAS) and time-of-flight secondary-ion mass spectrometry indicated negligible magnetic contaminants in the films. The presence of FM with concomitant large carrier densities was determined by a combination of superconducting quantum interference device magnetometry, electrical transport measurements, soft X-ray magnetic circular dichroism (SXMCD), XAS and optical magnetic circular dichroism, and was supported by first-principles calculations. SXMCD and XAS measurements revealed a 90 per cent contribution to FM from the Ti ions, and a 10 per cent contribution from the O ions. RBS/channelling measurements show complete Ta substitution in the Ti sites, though carrier activation was only 50 per cent at 5 per cent Ta concentration, implying compensation by cationic defects. The role of the Ti vacancy (V(Ti)) and Ti(3+) was studied via XAS and X-ray photoemission spectroscopy, respectively. It was found that, in films with strong FM, the V(Ti) signal was strong while the Ti(3+) signal was absent. We propose (in the absence of any obvious exchange mechanisms) that the localized magnetic moments, V(Ti) sites, are ferromagnetically ordered by itinerant carriers. Cationic-defect-induced magnetism is an alternative route to FM in wide-band-gap semiconducting oxides without any magnetic elements.
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Affiliation(s)
- A Rusydi
- NUSNNI-NanoCore, National University of Singapore, Republic of Singapore.
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46
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Vaz CAF. Electric field control of magnetism in multiferroic heterostructures. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:333201. [PMID: 22824827 DOI: 10.1088/0953-8984/24/33/333201] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We review the recent developments in the electric field control of magnetism in multiferroic heterostructures, which consist of heterogeneous materials systems where a magnetoelectric coupling is engineered between magnetic and ferroelectric components. The magnetoelectric coupling in these composite systems is interfacial in origin, and can arise from elastic strain, charge, and exchange bias interactions, with different characteristic responses and functionalities. Moreover, charge transport phenomena in multiferroic heterostructures, where both magnetic and ferroelectric order parameters are used to control charge transport, suggest new possibilities to control the conduction paths of the electron spin, with potential for device applications.
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Affiliation(s)
- C A F Vaz
- SwissFEL, Paul Scherrer Institut, Villigen PSI, Switzerland.
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47
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Yu J, Huang K, Wu H, Li P. Synthesis and magnetic properties of manganite multiple heterostructure nanoribbons. Dalton Trans 2012; 41:10286-91. [DOI: 10.1039/c2dt30624g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Rivera-Calzada A, Diaz-Guillen MR, Dura OJ, Sanchez-Santolino G, Pennycook TJ, Schmidt R, Bruno FY, Garcia- Barriocanal J, Sefrioui Z, Nemes NM, Garcia-Hernandez M, Varela M, Leon C, Pantelides ST, Pennycook SJ, Santamaria J. Tailoring interface structure in highly strained YSZ/STO heterostructures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:5268-5274. [PMID: 22299141 DOI: 10.1002/adma.201102106] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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49
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Valencia S, Crassous A, Bocher L, Garcia V, Moya X, Cherifi RO, Deranlot C, Bouzehouane K, Fusil S, Zobelli A, Gloter A, Mathur ND, Gaupp A, Abrudan R, Radu F, Barthélémy A, Bibes M. Interface-induced room-temperature multiferroicity in BaTiO₃. NATURE MATERIALS 2011; 10:753-758. [PMID: 21857674 DOI: 10.1038/nmat3098] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Accepted: 07/12/2011] [Indexed: 05/27/2023]
Abstract
Multiferroic materials possess two or more ferroic orders but have not been exploited in devices owing to the scarcity of room-temperature examples. Those that are ferromagnetic and ferroelectric have potential applications in multi-state data storage if the ferroic orders switch independently, or in electric-field controlled spintronics if the magnetoelectric coupling is strong. Future applications could also exploit toroidal moments and optical effects that arise from the simultaneous breaking of time-reversal and space-inversion symmetries. Here, we use soft X-ray resonant magnetic scattering and piezoresponse force microscopy to reveal that, at the interface with Fe or Co, ultrathin films of the archetypal ferroelectric BaTiO₃ simultaneously possess a magnetization and a polarization that are both spontaneous and hysteretic at room temperature. Ab initio calculations of realistic interface structures provide insight into the origin of the induced moments and bring support to this new approach for creating room-temperature multiferroics.
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Affiliation(s)
- S Valencia
- Helmholtz-Zentrum-Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, 12489 Berlin, Germany
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50
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Bruno FY, Garcia-Barriocanal J, Varela M, Nemes NM, Thakur P, Cezar JC, Brookes NB, Rivera-Calzada A, Garcia-Hernandez M, Leon C, Okamoto S, Pennycook SJ, Santamaria J. Electronic and magnetic reconstructions in La0.7Sr0.3MnO3/SrTiO3 heterostructures: a case of enhanced interlayer coupling controlled by the interface. PHYSICAL REVIEW LETTERS 2011; 106:147205. [PMID: 21561220 DOI: 10.1103/physrevlett.106.147205] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2010] [Indexed: 05/30/2023]
Abstract
We report on the magnetic coupling of La0.7Sr0.3MnO3 layers through SrTiO3 spacers in La0.7Sr0.3MnO3/SrTiO3 epitaxial heterostructures. Combined aberration-corrected microscopy and electron-energy-loss spectroscopy evidence charge transfer to the empty conduction band of the titanate. Ti d electrons interact via superexchange with Mn, giving rise to a Ti magnetic moment as demonstrated by x-ray magnetic circular dichroism. This induced magnetic moment in the SrTiO3 controls the bulk magnetic and transport properties of the superlattices when the titanate layer thickness is below 1 nm.
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Affiliation(s)
- F Y Bruno
- GFMC, Departamento Física Aplicada III, Universidad Complutense de Madrid, Campus Moncloa, 28040 Madrid, Spain
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