1
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Stramaglia F, Panchal G, Nolting F, Vaz CAF. Fully Magnetically Polarized Ultrathin La 0.8Sr 0.2MnO 3 Films. ACS APPLIED MATERIALS & INTERFACES 2024; 16:4138-4149. [PMID: 38216138 PMCID: PMC10811626 DOI: 10.1021/acsami.3c14031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 12/18/2023] [Accepted: 12/18/2023] [Indexed: 01/14/2024]
Abstract
We report the observation of fully magnetically polarized ultrathin La0.8Sr0.2MnO3 films by using LaMnO3 and La0.45Sr0.55MnO3 buffer layers grown epitaxially on SrTiO3(001) substrates by molecular beam epitaxy. Specifically, we show that La0.8Sr0.2MnO3 films grown on 12-unit-cell LaMnO3 have bulk-like magnetic moments starting from a single unit cell thickness, while for the 15-unit-cell La0.45Sr0.55MnO3 buffer layer, the La0.8Sr0.2MnO3 transitions from an antiferromagnetic state to a fully spin-polarized ferromagnetic state at 4 unit cells. The magnetic results are confirmed by X-ray magnetic circular dichroism, while linear dichroic measurements carried out for the La0.8Sr0.2MnO3/La0.45Sr0.55MnO3 series show the presence of an orbital reorganization at the transition from the antiferromagnetic to ferromagnetic state corresponding to a change from a preferred in-plane orbital hole occupancy, characteristic of the A-type antiferromagnetic state of La0.45Sr0.55MnO3, to preferentially out of plane. We interpret our findings in terms of the different electronic charge transfers between the adjacent layers, confined to the unit cell in the case of insulating LaMnO3 and extended to a few unit cells in the case of conducting La0.45Sr0.55MnO3. Our work demonstrates an approach to growing ultrathin mixed-valence manganite films that are fully magnetically polarized from the single unit cell, paving the way to fully exploring the unique electronic properties of this class of strongly correlated oxide materials.
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Affiliation(s)
| | - Gyanendra Panchal
- Swiss Light Source, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Frithjof Nolting
- Swiss Light Source, Paul Scherrer Institut, Villigen 5232, Switzerland
| | - Carlos A. F. Vaz
- Swiss Light Source, Paul Scherrer Institut, Villigen 5232, Switzerland
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2
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Giri A, Walton SG, Tomko J, Bhatt N, Johnson MJ, Boris DR, Lu G, Caldwell JD, Prezhdo OV, Hopkins PE. Ultrafast and Nanoscale Energy Transduction Mechanisms and Coupled Thermal Transport across Interfaces. ACS NANO 2023; 17:14253-14282. [PMID: 37459320 PMCID: PMC10416573 DOI: 10.1021/acsnano.3c02417] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 06/06/2023] [Indexed: 08/09/2023]
Abstract
The coupled interactions among the fundamental carriers of charge, heat, and electromagnetic fields at interfaces and boundaries give rise to energetic processes that enable a wide array of technologies. The energy transduction among these coupled carriers results in thermal dissipation at these surfaces, often quantified by the thermal boundary resistance, thus driving the functionalities of the modern nanotechnologies that are continuing to provide transformational benefits in computing, communication, health care, clean energy, power recycling, sensing, and manufacturing, to name a few. It is the purpose of this Review to summarize recent works that have been reported on ultrafast and nanoscale energy transduction and heat transfer mechanisms across interfaces when different thermal carriers couple near or across interfaces. We review coupled heat transfer mechanisms at interfaces of solids, liquids, gasses, and plasmas that drive the resulting interfacial heat transfer and temperature gradients due to energy and momentum coupling among various combinations of electrons, vibrons, photons, polaritons (plasmon polaritons and phonon polaritons), and molecules. These interfacial thermal transport processes with coupled energy carriers involve relatively recent research, and thus, several opportunities exist to further develop these nascent fields, which we comment on throughout the course of this Review.
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Affiliation(s)
- Ashutosh Giri
- Department
of Mechanical, Industrial and Systems Engineering, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Scott G. Walton
- Plasma
Physics Division, Naval Research Laboratory, Washington, DC 22032, United States
| | - John Tomko
- Department
of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, United States
| | - Niraj Bhatt
- Department
of Mechanical, Industrial and Systems Engineering, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Michael J. Johnson
- Plasma
Physics Division, Naval Research Laboratory, Washington, DC 22032, United States
| | - David R. Boris
- Plasma
Physics Division, Naval Research Laboratory, Washington, DC 22032, United States
| | - Guanyu Lu
- Department
of Mechanical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Joshua D. Caldwell
- Department
of Mechanical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States
- Interdisciplinary
Materials Science, Vanderbilt University, Nashville, Tennessee 37235, United States
- Vanderbilt
Institute of Nanoscale Science and Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Oleg V. Prezhdo
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
- Department
of Physics and Astronomy, University of
Southern California, Los Angeles, California 90089, United States
| | - Patrick E. Hopkins
- Department
of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, United States
- Department
of Materials Science and Engineering, University
of Virginia, Charlottesville, Virginia 22904, United States
- Department
of Physics, University of Virginia, Charlottesville, Virginia 22904, United States
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3
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MacManus-Driscoll JL, Wu R, Li W. Interface-related phenomena in epitaxial complex oxide ferroics across different thin film platforms: opportunities and challenges. MATERIALS HORIZONS 2023; 10:1060-1086. [PMID: 36815609 PMCID: PMC10068909 DOI: 10.1039/d2mh01527g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 02/16/2023] [Indexed: 06/18/2023]
Abstract
Interfaces in complex oxides give rise to fascinating new physical phenomena arising from the interconnected spin, lattice, charge and orbital degrees of freedom. Most commonly, interfaces are engineered in epitaxial superlattice films. Of growing interest also are epitaxial vertically aligned nanocomposite films where interfaces form by self-assembly. These two thin film forms offer different capabilities for materials tuning and have been explored largely separately from one another. Ferroics (ferroelectric, ferromagnetic, multiferroic) are among the most fascinating phenomena to be manipulated using interface effects. Hence, in this review we compare and contrast the ferroic properties that arise in these two different film forms, highlighting exemplary materials combinations which demonstrate novel, enhanced and/or emergent ferroic functionalities. We discuss the origins of the observed functionalities and propose where knowledge can be translated from one materials form to another, to potentially produce new functionalities. Finally, for the two different film forms we present a perspective on underexplored/emerging research directions.
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Affiliation(s)
| | - Rui Wu
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.
- Spin-X Institute, School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices, Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, South China University of Technology, Guangzhou 511442, China
| | - Weiwei Li
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.
- MIIT Key Laboratory of Aerospace Information Materials and Physics, State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
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4
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Shan W, Luo W. Interfacial charge transfer induced antiferromagnetic metals and magnetic phase transition in (CrO 2) m/(TaO 2) nsuperlattices. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 35:035801. [PMID: 36351299 DOI: 10.1088/1361-648x/aca19a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 11/09/2022] [Indexed: 06/16/2023]
Abstract
As a class of remarkable spintronic materials, intrinsic antiferromagnetic (AFM) metals are rare. The exploration and investigation of AFM metals are still in its infancy. Based on first-principles calculations, the interface-induced magnetic phenomena in the (CrO2)m/(TaO2)nsuperlattices are investigated, and a new series of AFM metals is predicted. Under different ratios ofm:nwith varying valence states of Cr, the (CrO2)m/(TaO2)nsuperlattices exhibit three different phases, including the AFM metal, the AFM semiconductor, and the ferromagnetic (FM) metal. In the AFM semiconducting phases, theintra-CrO2-monolayer magnetic exchange interaction is systematically discussed, corresponding tom = 1 orm = 2. Both the localization of the Cr 3 dorbitals and the crystal-field splitting are crucial for magnetic ordering in super-exchange interactions. Based on the analyses of the AFM semiconducting phases withm = 1 andm = 2, the mechanisms of AFM metallic phases with radios ofm:n<1/2and1/2<m:n<1/1are discussed in detail. Additionally, the AFM metallic superlattices can be tuned into a FM metallic phase by applying strain in thec-direction, such as a compression of 7% in the (CrO2)1/(TaO2)3superlattice, and a tensile strain of 7% in the (CrO2)2/(TaO2)3superlattice. The phase diagram of the (CrO2)m/(TaO2)nsuperlattices is obtained as a function of the layer thickness. This work provides new insights about realizing and manipulating AFM metals in artificial superlattices or heterostructures in experiments.
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Affiliation(s)
- Wanfei Shan
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Weidong Luo
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
- Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
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5
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Shan W, Luo W. Charge transfer and metal-insulator transition in (CrO 2) m/(TaO 2) nsuperlattices. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:385001. [PMID: 35835091 DOI: 10.1088/1361-648x/ac8133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 07/14/2022] [Indexed: 06/15/2023]
Abstract
Various interfacial emergent phenomena have been discovered in tunable nanoscale materials, especially in artificially designed epitaxial superlattices. In conjunction, the atomically fabricated superlattices have exhibited a plethora of exceptional properties compared to either bulk materials separately. Here, the (CrO2)m/(TaO2)nsuperlattices composed of two lattice-matched metallic metal oxides are constructed. With the help of first-principle density-functional theory calculations, a computational and theoretical study of (CrO2)m/(TaO2)nsuperlattices manifests the interfacial electronic properties in detail. The results suggest that emergent properties result from the charge transfer from the TaO2to CrO2layers. At two special ratios of1:1and1:2betweenmandn, the superlattices undergo metal-to-insulator transition. Additionally, the bands below the Fermi level become narrower with the increasing thickness of the CrO2and TaO2layers. The study reveals that the electronic reconstruction at the interface of two metallic materials can generate interesting physics, which points the direction for the manipulation of functionalities in artificial superlattices or heterostructures within a few atomic layers.
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Affiliation(s)
- Wanfei Shan
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Weidong Luo
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
- Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
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6
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Lu Q, Liu Z, Yang Q, Cao H, Balakrishnan P, Wang Q, Cheng L, Lu Y, Zuo JM, Zhou H, Quarterman P, Muramoto S, Grutter AJ, Chen H, Zhai X. Engineering Magnetic Anisotropy and Emergent Multidirectional Soft Ferromagnetism in Ultrathin Freestanding LaMnO 3 Films. ACS NANO 2022; 16:7580-7588. [PMID: 35446560 DOI: 10.1021/acsnano.1c11065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The combination of small coercive fields and weak magnetic anisotropy makes soft ferromagnetic films extremely useful for nanoscale devices that need to easily switch spin directions. However, soft ferromagnets are relatively rare, particularly in ultrathin films with thicknesses of a few nanometers or less. We have synthesized large-area, high-quality, ultrathin freestanding LaMnO3 films on Si and found unexpected soft ferromagnetism along both the in-plane and out-of-plane directions when the film thickness was reduced to 4 nm. We argue that the vanishing magnetic anisotropy between the two directions is a consequence of two coexisting magnetic easy axes in different atomic layers of the LaMnO3 film. Spectroscopy measurements reveal a change in Mn valence from 3+ in the film interior to approximately 2+ at the surfaces where considerable hydrogen infiltration occurs due to the water dissolving process. First-principles calculations show that protonation of LaMnO3 decreases the Mn valence and switches the magnetic easy axis from in-plane to out-of-plane as the Mn valence approaches 2+ from its 3+ bulk value. Our work demonstrates that ultrathin freestanding films can exhibit functional properties that are absent in homogeneous materials, concomitant with their convenient compatibility with Si-based devices.
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Affiliation(s)
- Qinwen Lu
- Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Zhiwei Liu
- Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Science, East China Normal University, Shanghai 200241, China
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai 200122, China
| | - Qun Yang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Hui Cao
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Purnima Balakrishnan
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Qing Wang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Long Cheng
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Yalin Lu
- Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Jian-Min Zuo
- Department of Materials Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Hua Zhou
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Patrick Quarterman
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Shin Muramoto
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Alexander J Grutter
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Hanghui Chen
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai 200122, China
- Department of Physics, New York University, New York, New York 10012, United States
| | - Xiaofang Zhai
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
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7
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Hoglund ER, Bao DL, O'Hara A, Makarem S, Piontkowski ZT, Matson JR, Yadav AK, Haislmaier RC, Engel-Herbert R, Ihlefeld JF, Ravichandran J, Ramesh R, Caldwell JD, Beechem TE, Tomko JA, Hachtel JA, Pantelides ST, Hopkins PE, Howe JM. Emergent interface vibrational structure of oxide superlattices. Nature 2022; 601:556-561. [PMID: 35082421 PMCID: PMC8791828 DOI: 10.1038/s41586-021-04238-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 11/09/2021] [Indexed: 02/05/2023]
Abstract
As the length scales of materials decrease, the heterogeneities associated with interfaces become almost as important as the surrounding materials. This has led to extensive studies of emergent electronic and magnetic interface properties in superlattices1–9. However, the interfacial vibrations that affect the phonon-mediated properties, such as thermal conductivity10,11, are measured using macroscopic techniques that lack spatial resolution. Although it is accepted that intrinsic phonons change near boundaries12,13, the physical mechanisms and length scales through which interfacial effects influence materials remain unclear. Here we demonstrate the localized vibrational response of interfaces in strontium titanate–calcium titanate superlattices by combining advanced scanning transmission electron microscopy imaging and spectroscopy, density functional theory calculations and ultrafast optical spectroscopy. Structurally diffuse interfaces that bridge the bounding materials are observed and this local structure creates phonon modes that determine the global response of the superlattice once the spacing of the interfaces approaches the phonon spatial extent. Our results provide direct visualization of the progression of the local atomic structure and interface vibrations as they come to determine the vibrational response of an entire superlattice. Direct observation of such local atomic and vibrational phenomena demonstrates that their spatial extent needs to be quantified to understand macroscopic behaviour. Tailoring interfaces, and knowing their local vibrational response, provides a means of pursuing designer solids with emergent infrared and thermal responses. The vibrational states emerging at the interface in oxide superlattices are characterized theoretically and at atomic resolution, showing the impact of material length scales on structure and vibrational response.
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Affiliation(s)
- Eric R Hoglund
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, USA.
| | - De-Liang Bao
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA
| | - Andrew O'Hara
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA
| | - Sara Makarem
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, USA
| | | | - Joseph R Matson
- Department of Mechanical Engineering and Electrical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Ajay K Yadav
- Department of Materials Science and Engineering, University of California Berkley, Berkley, CA, USA
| | - Ryan C Haislmaier
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, USA
| | - Roman Engel-Herbert
- Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany.,Institut für Physik, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Jon F Ihlefeld
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, USA
| | - Jayakanth Ravichandran
- Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA, USA
| | - Ramamoorthy Ramesh
- Department of Materials Science and Engineering, University of California Berkley, Berkley, CA, USA
| | - Joshua D Caldwell
- Department of Mechanical Engineering and Electrical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Thomas E Beechem
- Sandia National Laboratories, Albuquerque, NM, USA.,Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM, USA.,School of Mechanical Engineering and the Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA
| | - John A Tomko
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, USA
| | - Jordan A Hachtel
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
| | - Sokrates T Pantelides
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA. .,Department of Electrical and Computer Engineering, Vanderbilt University, Nashville, TN, USA.
| | - Patrick E Hopkins
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, USA. .,Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, USA. .,Department of Physics, University of Virginia, Charlottesville, VA, USA.
| | - James M Howe
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, USA.
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8
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Ye B, Miao T, Zhu Y, Huang H, Yang Y, Shuai M, Zhu Z, Guo H, Wang W, Zhu Y, Yin L, Shen J. Pulsed laser deposition of large-sized superlattice films with high uniformity. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:113906. [PMID: 34852506 DOI: 10.1063/5.0068795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 10/21/2021] [Indexed: 06/13/2023]
Abstract
Oxide superlattices often exhibit emergent physical properties that are desirable for future information device applications. The most common growth technique for fabrication of oxide superlattices is pulsed laser deposition (PLD), which is convenient yet powerful for the growth of various oxide superlattices. However, the sample size prepared by PLD is rather small confined by the plasmon plume, which greatly limits its potential for device applications. Here, we design a PLD system that is capable of fabricating large-sized oxide superlattices with high uniformity. Specifically, during growth, the laser beam scans the target surface by combining the pitch and yaw angle rotation of the high reflective mirror and the linear motion of the focus lens. A SiC susceptor is placed in between the sample holder and the substrate to improve the large area infrared heating efficiency. Using such a system, droplet-free 10 × 10 mm2 [(LSMO)12/(PCMO)6]7 superlattices are epitaxially grown with the same period of superlattices across the whole sample areas. The high uniformity of the superlattices is further illustrated by near identical physical properties of all regions of the superlattice films. The present PLD system can be used to grow various kinds of oxide superlattices with the area size as large as 2 in., which is highly useful for device applications of oxides.
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Affiliation(s)
- Biying Ye
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Tian Miao
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Yi Zhu
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Haiming Huang
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Yulong Yang
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Mingming Shuai
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Zhifei Zhu
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Hangwen Guo
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Wenbin Wang
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Yinyan Zhu
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Lifeng Yin
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Jian Shen
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
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9
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Yang M, Jin K, Yao H, Zhang Q, Ji Y, Gu L, Ren W, Zhao J, Wang J, Guo E, Ge C, Wang C, Xu X, Wu Q, Yang G. Emergent Magnetic Phenomenon with Unconventional Structure in Epitaxial Manganate Thin Films. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2100177. [PMID: 34258162 PMCID: PMC8261492 DOI: 10.1002/advs.202100177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 02/25/2021] [Indexed: 06/13/2023]
Abstract
A variety of emergent phenomena are enabled by interface engineering in the complex oxides heterostructures. While extensive attention is attracted to LaMnO3 (LMO) thin films for observing the control of functionalities at its interface with substrate, the nature of the magnetic phases in the thin film is, however, controversial. Here, it is reported that the ferromagnetism in two and five unit cells thick LMO films epitaxially deposited on (001)-SrTiO3 substrates, a ferromagnetic/ferromagnetic coupling in eight and ten unit cells ones, and a striking ferromagnetic/antiferromagnetic pinning effect with apparent positive exchange bias in 15 and 20 unit cells ones are observed. This novel phenomenon in both 15 and 20 unit cells films indicates a coexistence of three magnetic orderings in a single LMO film. The high-resolution scanning transmission electron microscopy suggests a P21/n to Pbnm symmetry transition from interface to surface, with the spatial stratification of MnO6 octahedral morphology, corresponding to different magnetic orderings. These results can shed some new lights on manipulating the functionality of oxides by interface engineering.
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Affiliation(s)
- Mingwei Yang
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
- School of Physical Sciences, University of Chinese Academy of SciencesBeijing100049China
| | - Kuijuan Jin
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
- School of Physical Sciences, University of Chinese Academy of SciencesBeijing100049China
- Songshan Lake Materials LaboratoryDongguanGuangdong523808China
| | - Hongbao Yao
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
- School of Physical Sciences, University of Chinese Academy of SciencesBeijing100049China
| | - Qinghua Zhang
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
| | - Yiru Ji
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
- School of Physical Sciences, University of Chinese Academy of SciencesBeijing100049China
| | - Lin Gu
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
- School of Physical Sciences, University of Chinese Academy of SciencesBeijing100049China
| | - Wenning Ren
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
- School of Physical Sciences, University of Chinese Academy of SciencesBeijing100049China
| | - Jiali Zhao
- Beijing Synchrotron Radiation FacilityInstitute of High Energy PhysicsChinese Academy of SciencesBeijing100039China
| | - Jiaou Wang
- Beijing Synchrotron Radiation FacilityInstitute of High Energy PhysicsChinese Academy of SciencesBeijing100039China
| | - Er‐Jia Guo
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
- School of Physical Sciences, University of Chinese Academy of SciencesBeijing100049China
- Songshan Lake Materials LaboratoryDongguanGuangdong523808China
| | - Chen Ge
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
- School of Physical Sciences, University of Chinese Academy of SciencesBeijing100049China
| | - Can Wang
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
- School of Physical Sciences, University of Chinese Academy of SciencesBeijing100049China
- Songshan Lake Materials LaboratoryDongguanGuangdong523808China
| | - Xiulai Xu
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
- School of Physical Sciences, University of Chinese Academy of SciencesBeijing100049China
- Songshan Lake Materials LaboratoryDongguanGuangdong523808China
| | - Qiong Wu
- International Center for Quantum MaterialsSchool of PhysicsPeking UniversityBeijing100871China
| | - Guozhen Yang
- Institute of PhysicsChinese Academy of SciencesBeijing100190China
- School of Physical Sciences, University of Chinese Academy of SciencesBeijing100049China
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10
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Cao H, Guo H, Shao YC, Liu Q, Feng X, Lu Q, Wang Z, Zhao A, Fujimori A, Chuang YD, Zhou H, Zhai X. Realization of Electron Antidoping by Modulating the Breathing Distortion in BaBiO 3. NANO LETTERS 2021; 21:3981-3988. [PMID: 33886344 DOI: 10.1021/acs.nanolett.1c00750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The recent proposal of antidoping scheme breaks new ground in conceiving conversely functional materials and devices; yet, the few available examples belong to the correlated electron systems. Here, we demonstrate both theoretically and experimentally that the main group oxide BaBiO3 is a model system for antidoping using oxygen vacancies. The first-principles calculations show that the band gap systematically increases due to the strongly enhanced Bi-O breathing distortions away from the vacancies and the annihilation of Bi 6s/O 2p hybridized conduction bands near the vacancies. Our further spectroscopic experiments confirm that the band gap increases systematically with electron doping, with a maximal gap enhancement of ∼75% when the film's stoichiometry is reduced to BaBiO2.75. These results unambiguously demonstrate the remarkable antidoping effect in a material without strong electron correlations and underscores the importance of bond disproportionation in realizing such an effect.
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Affiliation(s)
- Hui Cao
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Hongli Guo
- School of Physics and Technology and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan 430072, China
| | - Yu-Cheng Shao
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | | | - Xuefei Feng
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 United States
| | | | | | - Aidi Zhao
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Atsushi Fujimori
- Department of Applied Physics, Waseda University, Okubo, Shinjuku, Tokyo 169-8555, Japan
| | - Yi-De Chuang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 United States
| | - Hua Zhou
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Xiaofang Zhai
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
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11
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Chen B, Jovanovic Z, Abel S, Le PTP, Halisdemir U, Smithers M, Diaz-Fernandez D, Spreitzer M, Fompeyrine J, Rijnders G, Koster G. Integration of Single Oriented Oxide Superlattices on Silicon Using Various Template Techniques. ACS APPLIED MATERIALS & INTERFACES 2020; 12:42925-42932. [PMID: 32842731 PMCID: PMC7517711 DOI: 10.1021/acsami.0c10579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 08/26/2020] [Indexed: 06/11/2023]
Abstract
To benefit from the diverse functionalities of perovskite oxides in silicon-based complementary metal oxide semiconductor (CMOS) technology, integrating oxides into a silicon platform has become one of the major tasks for oxide research. Using the deposition of LaMnO3/SrTiO3 (STO) superlattices (SLs) as a case study, we demonstrate that (001) single oriented oxide SLs can be integrated on Si using various template techniques, including a single-layer buffer of STO prepared by molecular beam epitaxy (MBE) and pulsed laser deposition, a multilayer buffer of Y-stabilized zirconia/CeO2/LaNiO3/STO, and STO-coated two-dimensional nanosheets of Ca2Nb3O10 (CNO) and reduced graphene oxide. The textured SL grown on STO-coated CNO nanosheets shows the highest crystallinity, owing to the small lattice mismatch between CNO and STO as well as less clamping from a Si substrate. The epitaxial SL grown on STO buffer prepared by MBE suffers the largest thermal strain, giving rise to a strongly suppressed saturation magnetization but an enhanced coercive field, as compared to the reference SL grown on an STO single crystal. These optional template techniques used for integrating oxides on Si are of significance to fulfill practical applications of oxide films in different fields.
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Affiliation(s)
- Binbin Chen
- MESA+
Institute for Nanotechnology, University
of Twente, 7500 AE Enschede, The Netherlands
| | - Zoran Jovanovic
- Advanced
Materials Department, Jožef Stefan
Institute, 1000 Ljubljana, Slovenia
- Laboratory
of Physics, Vinca Institute of Nuclear Sciences, University of Belgrade, 11000 Belgrade, Serbia
| | - Stefan Abel
- IBM
Research-Zurich, 8803 Rüschlikon, Switzerland
- Lumiphase
AG, 8003 Zürich, Switzerland
| | - Phu Tran Phong Le
- MESA+
Institute for Nanotechnology, University
of Twente, 7500 AE Enschede, The Netherlands
| | - Ufuk Halisdemir
- MESA+
Institute for Nanotechnology, University
of Twente, 7500 AE Enschede, The Netherlands
| | - Mark Smithers
- MESA+
Institute for Nanotechnology, University
of Twente, 7500 AE Enschede, The Netherlands
| | | | - Matjaž Spreitzer
- Advanced
Materials Department, Jožef Stefan
Institute, 1000 Ljubljana, Slovenia
| | - Jean Fompeyrine
- IBM
Research-Zurich, 8803 Rüschlikon, Switzerland
- Lumiphase
AG, 8003 Zürich, Switzerland
| | - Guus Rijnders
- MESA+
Institute for Nanotechnology, University
of Twente, 7500 AE Enschede, The Netherlands
| | - Gertjan Koster
- MESA+
Institute for Nanotechnology, University
of Twente, 7500 AE Enschede, The Netherlands
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12
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Zhang B, Wu L, Feng X, Li C, Miao X, Hui Y, Zhao K, Ding J, Jin B, Chen J, Zhu Y, Sun CJ, Chow GM. Tuning Irreversible Magnetoresistance in Pr 0.67Sr 0.33MnO 3 Film via Octahedral Rotation. ACS APPLIED MATERIALS & INTERFACES 2020; 12:43222-43230. [PMID: 32820885 DOI: 10.1021/acsami.0c10402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The oxygen octahedral rotation around the out-of-plane axis is explored to study its effect on metastable status, magnetic cluster glass in manganite. The antiphase rotation around the out-of-plane axis (TiO6 a0a0c-) of SrTiO3 enhances the Mn-O bond anisotropy along in-plane and out-of-plane directions and weakens the ferromagnetic interactions in a 12 nm Pr0.67Sr0.33MnO3 film on the (001) SrTiO3 substrate, which together promote the formation of magnetic cluster-glassiness and enlarges the irreversible magnetoresistance (MR) effect with enhanced relaxation time of charge carriers. The effect of TiO6 a0a0c- in the SrTiO3 substrate on material properties is obvious with a large irreversible MR effect for thin films, which fades away with the increase in film thickness. At 10 K, the irreversible MR is 0.91 for the 12 nm film and 0.22 for the 30 nm film. This work extends current understanding on interfacial coupling to metastable status and could help explore other systems in the perovskite structure with octahedral rotation.
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Affiliation(s)
- Bangmin Zhang
- Centre for Physical Mechanics and Biophysics, School of Physics, Sun Yat-sen University, Guangzhou 510275, China
| | - Lijun Wu
- Condensed Matter Physics & Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Xin Feng
- Department of Materials Science & Engineering, National University of Singapore, 117575, Singapore
| | - Chun Li
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
| | - Xinyang Miao
- Petroleum and Chemical Industry Federation Key Laboratory of Oil and Gas Terahertz Spectroscopy and Photoelectric Detection, China University of Petroleum, Beijing 102249, China
| | - Yajuan Hui
- Department of Materials Science & Engineering, National University of Singapore, 117575, Singapore
| | - Kun Zhao
- Petroleum and Chemical Industry Federation Key Laboratory of Oil and Gas Terahertz Spectroscopy and Photoelectric Detection, China University of Petroleum, Beijing 102249, China
| | - Jun Ding
- Department of Materials Science & Engineering, National University of Singapore, 117575, Singapore
| | - Biaobing Jin
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
| | - Jingsheng Chen
- Department of Materials Science & Engineering, National University of Singapore, 117575, Singapore
| | - Yimei Zhu
- Condensed Matter Physics & Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Cheng-Jun Sun
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Gan Moog Chow
- Department of Materials Science & Engineering, National University of Singapore, 117575, Singapore
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13
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Engineered Layer-Stacked Interfaces Inside Aurivillius-Type Layered Oxides Enables Superior Ferroelectric Property. CRYSTALS 2020. [DOI: 10.3390/cryst10080710] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Layer engineering with different layer numbers inside Aurivillius-type layered structure, similar to interface engineering in heterojunctions or superlattices, can give rise to excellent physical properties due to the correlated layer-stacked interfaces of two different layer phases with different strain states. In this work, using the solid-state reactions from Aurivillius-type Bi3TiNbO9 (2-layer) and Bi4Ti3O12 (3-layer) ferroelectric powder mixtures, single-phase compound of Bi7Ti4NbO21 with an intergrowth structure of 2-layer and 3-layer perovskite slabs sandwiched between the Bi-O layers was synthesized and the effects of this layer-engineered strategy on the structure, Raman-vibration and ferroelectric properties were systematically investigated. The mostly-ordered intergrowth phase was observed clearly by utilizing X-ray diffraction and advanced electron micro-techniques. Uniformly dispersions and collaborative vibrations of Ti and Nb ions in the layer-engineered Bi7Ti4NbO21 were demonstrated. Remarkably, dielectric and ferroelectric properties were also recorded and an enhanced ferroelectric response was found in the layer-engineered mixed-layer sample with high ferroelectric Curie temperature, compared with the homogeneous 2-layer and 3-layer samples. Analyses of the Raman spectra and atomic structures confirmed that the performance improvement of the layer-engineered sample is intrinsic to the correlated layer-stacked interfaces inside the Aurivillius-type layered oxides, arising from strain-induced lattice distortions at the interfaces.
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14
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Skoropata E, Nichols J, Ok JM, Chopdekar RV, Choi ES, Rastogi A, Sohn C, Gao X, Yoon S, Farmer T, Desautels RD, Choi Y, Haskel D, Freeland JW, Okamoto S, Brahlek M, Lee HN. Interfacial tuning of chiral magnetic interactions for large topological Hall effects in LaMnO 3/SrIrO 3 heterostructures. SCIENCE ADVANCES 2020; 6:eaaz3902. [PMID: 32923583 PMCID: PMC7455502 DOI: 10.1126/sciadv.aaz3902] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 05/22/2020] [Indexed: 05/23/2023]
Abstract
Chiral interactions in magnetic systems can give rise to rich physics manifested, for example, as nontrivial spin textures. The foremost interaction responsible for chiral magnetism is the Dzyaloshinskii-Moriya interaction (DMI), resulting from inversion symmetry breaking in the presence of strong spin-orbit coupling. However, the atomistic origin of DMIs and their relationship to emergent electrodynamic phenomena, such as topological Hall effect (THE), remain unclear. Here, we investigate the role of interfacial DMIs in 3d-5d transition metal-oxide-based LaMnO3/SrIrO3 superlattices on THE from a chiral spin texture. By additively engineering the interfacial inversion symmetry with atomic-scale precision, we directly link the competition between interfacial collinear ferromagnetic interactions and DMIs to an enhanced THE. The ability to control the DMI and resulting THE points to a pathway for harnessing interfacial structures to maximize the density of chiral spin textures useful for developing high-density information storage and quantum magnets for quantum information science.
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Affiliation(s)
- Elizabeth Skoropata
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - John Nichols
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Jong Mok Ok
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Rajesh V. Chopdekar
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Eun Sang Choi
- National High Field Magnet Laboratory, Florida State University, Tallahassee, FL 32310, USA
| | - Ankur Rastogi
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Changhee Sohn
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Xiang Gao
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Sangmoon Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Thomas Farmer
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Ryan D. Desautels
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Yongseong Choi
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Daniel Haskel
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
| | - John W. Freeland
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Satoshi Okamoto
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Matthew Brahlek
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Ho Nyung Lee
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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15
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Cui Z, Grutter AJ, Zhou H, Cao H, Dong Y, Gilbert DA, Wang J, Liu YS, Ma J, Hu Z, Guo J, Xia J, Kirby BJ, Shafer P, Arenholz E, Chen H, Zhai X, Lu Y. Correlation-driven eightfold magnetic anisotropy in a two-dimensional oxide monolayer. SCIENCE ADVANCES 2020; 6:eaay0114. [PMID: 32300646 PMCID: PMC7148107 DOI: 10.1126/sciadv.aay0114] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Accepted: 01/13/2020] [Indexed: 05/25/2023]
Abstract
Engineering magnetic anisotropy in two-dimensional systems has enormous scientific and technological implications. The uniaxial anisotropy universally exhibited by two-dimensional magnets has only two stable spin directions, demanding 180° spin switching between states. We demonstrate a previously unobserved eightfold anisotropy in magnetic SrRuO3 monolayers by inducing a spin reorientation in (SrRuO3)1/(SrTiO3) N superlattices, in which the magnetic easy axis of Ru spins is transformed from uniaxial 〈001〉 direction (N < 3) to eightfold 〈111〉 directions (N ≥ 3). This eightfold anisotropy enables 71° and 109° spin switching in SrRuO3 monolayers, analogous to 71° and 109° polarization switching in ferroelectric BiFeO3. First-principle calculations reveal that increasing the SrTiO3 layer thickness induces an emergent correlation-driven orbital ordering, tuning spin-orbit interactions and reorienting the SrRuO3 monolayer easy axis. Our work demonstrates that correlation effects can be exploited to substantially change spin-orbit interactions, stabilizing unprecedented properties in two-dimensional magnets and opening rich opportunities for low-power, multistate device applications.
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Affiliation(s)
- Zhangzhang Cui
- Hefei National Laboratory for Physical Sciences at the Microscale, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China
- Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Alexander J. Grutter
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Hua Zhou
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Hui Cao
- Hefei National Laboratory for Physical Sciences at the Microscale, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China
- Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Yongqi Dong
- Hefei National Laboratory for Physical Sciences at the Microscale, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Dustin A. Gilbert
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - Jingyuan Wang
- Department of Physics, University of California, Irvine, Irvine, CA 92697, USA
| | - Yi-Sheng Liu
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Jiaji Ma
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai 200122, China
| | - Zhenpeng Hu
- School of Physics, Nankai University, Tianjin 300071, China
| | - Jinghua Guo
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Jing Xia
- Department of Physics, University of California, Irvine, Irvine, CA 92697, USA
| | - Brian J. Kirby
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Padraic Shafer
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Elke Arenholz
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Cornell High Energy Synchrotron Source, Cornell University, Ithaca, NY 14853, USA
| | - Hanghui Chen
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai 200122, China
- State Key Laboratory of Precision Spectroscopy, School of Physical and Material Sciences, East China Normal University, Shanghai 200062, China
- Department of Physics, New York University, New York, NY 10027, USA
| | - Xiaofang Zhai
- Hefei National Laboratory for Physical Sciences at the Microscale, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China
- Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Yalin Lu
- Hefei National Laboratory for Physical Sciences at the Microscale, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China
- Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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16
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Li J, Wang Y, Zhang G, Yin H, Chen D, Sun W, Shi B, Cheng Z. Seeking large Seebeck effects in LaX(X = Mn and Co)O 3/SrTiO 3 superlattices by exploiting high spin-polarized effects. Phys Chem Chem Phys 2019; 21:14973-14983. [PMID: 31237601 DOI: 10.1039/c9cp02486g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
SrTiO3-based transition-metal oxide heterostructures with superconducting, ferromagnetic, ferroelectric, and ferroelastic properties exhibit high application potential in the fields of energy storage, energy conversion, and spintronic devices. Meanwhile, high effective (charge)-Seebeck coefficient materials composed of a ferromagnetic layer and SrTiO3 insulator layer have been achieved but we still have blocks to pursuing high spin-Seebeck coefficient materials. Here, we use first-principles calculations combined with spin-resolved Boltzmann transport theory to investigate the spin- and effective-Seebeck coefficients in the LaX(X = Mn and Co)O3/SrTiO3 superlattice. Compared with the LaMnO3/SrTiO3 superlattice, LaCoO3/SrTiO3 with ferromagnetic ordering has high spin polarization, relatively low valence valley degeneracy but high effective mass. Utilizing these characteristics, the maximum spin-Seebeck coefficient of LaMnO3/SrTiO3 is -152 μV K-1 at 450 K along the cross-plane direction, while LaCoO3/SrTiO3 reaches -247 μV K-1 under the same conditions. Interestingly, the spin- and effective-Seebeck coefficients are amazingly consistent with each other below 200 K, which indicates that one spin channel (spin-up or spin-down) dominates the carrier transport, and the other one (spin-down or spin-up) is filtered out. These characteristics are mainly associated with the magnetic MnO2/CoO2 layers with distinct dxy and dz2 orbitals near the Fermi level. Our results clarify the relationship of spin- and effective-Seebeck coefficients and indicate that SrTiO3-based transition metal oxide heterointerfaces are a key candidate for spin caloritronics.
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Affiliation(s)
- Jingyu Li
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Yuanxu Wang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Guangbiao Zhang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Huabing Yin
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Dong Chen
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Wei Sun
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Beibei Shi
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Zhenxiang Cheng
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China. and Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, North Wollongong, Australia.
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17
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Chen D, Zhang G, Cheng Z, Dong S, Wang Y. Robust manipulation of magnetism in La AO 3/BaTiO 3 ( A = Fe, Mn and Cr) superstructures by ferroelectric polarization. IUCRJ 2019; 6:189-196. [PMID: 30867916 PMCID: PMC6400182 DOI: 10.1107/s205225251801624x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 11/15/2018] [Indexed: 06/09/2023]
Abstract
Robust control of magnetism is both fundamentally and practically meaningful and highly desirable, although it remains a big challenge. In this work, perovskite oxide superstructures LaFeO3/BaTiO3 (LFO/BTO), LaMnO3/BaTiO3 (LMO/BTO) and LaCrO3/BaTiO3 (LCO/BTO) (001) are designed to facilitate tuning of magnetism by the electric field from ferroelectric polarization, and are systemically investigated via first-principles calculations. The results show that the magnetic ordering, conductivity and exchange interactions can be controlled simultaneously or individually by the reorientation of the ferroelectric polarization of BTO in these designed superstructures. Self-consistent calculations within the generalized gradient approximation plus on-site Coulomb correction did not produce distinct rotations of oxygen octahedra, but there were obvious changes in bond length between oxygen and the cations. These changes cause tilting of the oxygen octahedra and lead to spin, orbital and bond reconstruction at the interface, which is the structural basis responsible for the manipulation. With the G-type antiferromagnetic (G-AFM) ordering unchanged for both ±P cases, a metal-insulator transition can be observed in the LFO/BTO superstructure, which is controlled by the LFO thin film. The LMO/BTO system has A-type antiferromagnetic (A-AFM) ordering with metallic behavior in the +P case, while it shifts to a half-metallic ferromagnetic ordering when the direction of the polarization is switched. LCO/BTO exhibits C-type antiferromagnetic (C-AFM) and G-AFM orders in the +P and -P cases, respectively. The three purpose-designed superstructures with robust intrinsic magnetoelectric coupling are a particularly interesting model system that can provide guidance for the development of this field for future applications.
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Affiliation(s)
- Dong Chen
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475000, People’s Republic of China
| | - Guangbiao Zhang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475000, People’s Republic of China
| | - Zhenxiang Cheng
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475000, People’s Republic of China
- Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong NSW 2500, Australia
| | - Shuai Dong
- School of Physics, Southeast University, Nanjing 211189, People’s Republic of China
| | - Yuanxu Wang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475000, People’s Republic of China
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18
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Liu H, Dong Y, Xu D, Karapetrova E, Lee S, Stan L, Zapol P, Zhou H, Fong DD. Dynamic Field Modulation of the Octahedral Framework in Metal Oxide Heterostructures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1804775. [PMID: 30370580 DOI: 10.1002/adma.201804775] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 09/20/2018] [Indexed: 06/08/2023]
Abstract
Control over the oxygen octahedral framework is widely recognized as key to the design of functional properties in perovskite oxide heterostructures. Although the oxygen octahedral framework can be manipulated during synthesis, the as-grown oxygen octahedra generally remain fixed, preventing the development of adaptive behavior in electronic and ionotronic systems. Here, it is demonstrated that the oxygen octahedral framework can be dynamically and reversibly manipulated by an electric field through the coupling with oxygen vacancies. Studying model WO3 heterostructures during ionic liquid gating with a combination of in situ X-ray scattering and spectroscopy, it is shown that large changes in electronic properties can arise due to the increased flexibility of the octahedral network at high vacancy concentrations. The results describe a generic framework for the construction of dynamic systems and devices with an array of field-tunable properties.
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Affiliation(s)
- Huajun Liu
- Materials Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore, 138634, Singapore
| | - Yongqi Dong
- Materials Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Dongwei Xu
- Materials Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
- School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China
| | - Evguenia Karapetrova
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Sungsik Lee
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Liliana Stan
- Center for Nanoscale Materials, Nanoscience and Technology Division, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Peter Zapol
- Materials Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Hua Zhou
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Dillon D Fong
- Materials Science Division, Argonne National Laboratory, Argonne, IL, 60439, USA
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19
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Wang JF, Li Z, Zhuang ZT, Zhang YM, Zhang JT. Coupled magnetic-elastic and metal-insulator transition in epitaxially strained SrMnO 3/BaMnO 3 superlattices. RSC Adv 2018; 8:36407-36411. [PMID: 35558456 PMCID: PMC9088842 DOI: 10.1039/c8ra05737k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 10/13/2018] [Indexed: 11/21/2022] Open
Abstract
The spin-phonon coupling and the effects of strain on the ground-state phases of artificial SrMnO3/BaMnO3 superlattices were systematically investigated using first-principles calculations. The results confirm that this system has antiferromagnetic order and an intrinsic ferroelectric polarisation with the P4mm space group. A tensile epitaxial strain can drive the ground state to another antiferromagnetic-ferroelectric phase and then to a ferromagnetic-ferroelectric phase with the Amm2 space group, accompanied by a change in the ferroelectric polarisation from an out-of-plane direction to an in-plane direction. In contrast, a compressive strain could induce a transition from the antiferromagnetic insulator phase to the ferromagnetic metal phase.
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Affiliation(s)
- Jin-Feng Wang
- School of Physical and Technology, National Demonstration Center for Experimental Physics Education, Henan Normal University, Henan Key Laboratory of Photovoltaic Materials Xinxiang 453007 China
| | - Zheng Li
- School of Physical and Technology, National Demonstration Center for Experimental Physics Education, Henan Normal University, Henan Key Laboratory of Photovoltaic Materials Xinxiang 453007 China
| | - Zhao-Tong Zhuang
- School of Physical and Technology, National Demonstration Center for Experimental Physics Education, Henan Normal University, Henan Key Laboratory of Photovoltaic Materials Xinxiang 453007 China
| | - Yan-Ming Zhang
- School of Physical and Technology, National Demonstration Center for Experimental Physics Education, Henan Normal University, Henan Key Laboratory of Photovoltaic Materials Xinxiang 453007 China
| | - Jun-Ting Zhang
- Department of Physics, China University of Mining and Technology Xuzhou 221116 China
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20
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Symmetry mismatch-driven perpendicular magnetic anisotropy for perovskite/brownmillerite heterostructures. Nat Commun 2018; 9:1923. [PMID: 29765023 PMCID: PMC5953968 DOI: 10.1038/s41467-018-04304-7] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 04/18/2018] [Indexed: 12/22/2022] Open
Abstract
Grouping different transition metal oxides together by interface engineering is an important route toward emergent phenomenon. While most of the previous works focused on the interface effects in perovskite/perovskite heterostructures, here we reported on a symmetry mismatch-driven spin reorientation toward perpendicular magnetic anisotropy in perovskite/brownmillerite heterostructures, which is scarcely seen in tensile perovskite/perovskite heterostructures. We show that alternately stacking perovskite La2/3Sr1/3MnO3 and brownmillerite LaCoO2.5 causes a strong interface reconstruction due to symmetry discontinuity at interface: neighboring MnO6 octahedra and CoO4 tetrahedra at the perovskite/brownmillerite interface cooperatively relax in a manner that is unavailable for perovskite/perovskite interface, leading to distinct orbital reconstructions and thus the perpendicular magnetic anisotropy. Moreover, the perpendicular magnetic anisotropy is robust, with an anisotropy constant two orders of magnitude greater than the in-plane anisotropy of the perovskite/perovskite interface. The present work demonstrates the great potential of symmetry engineering in designing artificial materials on demand. Complex oxide heterostructures exhibit multifunctional behaviour that could be used in a range of device applications. Here, the authors observe that reconstruction at oxide perovskite/brownmillerite interfaces leads to perpendicular magnetic spin orientation, with potential use in spintronic devices.
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21
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Nanoscale Structural Modulation and Low-temperature Magnetic Response in Mixed-layer Aurivillius-type Oxides. Sci Rep 2018; 8:871. [PMID: 29343705 PMCID: PMC5772624 DOI: 10.1038/s41598-018-19448-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 01/02/2018] [Indexed: 12/02/2022] Open
Abstract
Nanoscale structural modulation with different layer numbers in layer-structured complex oxides of the binary Bi4Ti3O12-BiFeO3 system can give rise to intriguing phenomena and extraordinary properties, originating from the correlated interfaces of two different phases with different strain states. In this work, we studied the nanoscale structural modulation induced by Co-substitution in the Aurivillius-type oxide of Bi11Fe3Ti6O33 with a unique and naturally occurred mixed-layer structure. Nanoscale structural evolution via doping occurred from the phase-modulated structure composed of 4- and 5-layer phases to a homogeneous 4-layer structure was clearly observed utilizing x-ray diffraction and electron micro-techniques. Significantly, magnetic response for the samples under various temperatures was recorded and larger magnetic coercive fields (e.g. Hc ∼ 10 kOe at 50 K) were found in the phase-modulated samples. Analyses of the x-ray absorption spectra and magnetic response confirmed that the low-temperature magnetic behaviour should be intrinsic to the phase-modulated structure inside the structural transformation region, mainly arising from structural distortions at the correlated interfaces.
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22
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Moon EJ, He Q, Ghosh S, Kirby BJ, Pantelides ST, Borisevich AY, May SJ. Structural "δ Doping" to Control Local Magnetization in Isovalent Oxide Heterostructures. PHYSICAL REVIEW LETTERS 2017; 119:197204. [PMID: 29219521 DOI: 10.1103/physrevlett.119.197204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Indexed: 06/07/2023]
Abstract
Modulation and δ-doping strategies, in which atomically thin layers of charged dopants are precisely deposited within a heterostructure, have played enabling roles in the discovery of new physical behavior in electronic materials. Here, we demonstrate a purely structural "δ-doping" strategy in complex oxide heterostructures, in which atomically thin manganite layers are inserted into an isovalent manganite host, thereby modifying the local rotations of corner-connected MnO_{6} octahedra. Combining scanning transmission electron microscopy, polarized neutron reflectometry, and density functional theory, we reveal how local magnetic exchange interactions are enhanced within the spatially confined regions of suppressed octahedral rotations. The combined experimental and theoretical results illustrate the potential to utilize noncharge-based approaches to "doping" in order to enhance or suppress functional properties within spatially confined regions of oxide heterostructures.
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Affiliation(s)
- E J Moon
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - Q He
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S Ghosh
- Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, USA
- SRM Research Institute and Department of Physics and Nanotechnology, SRM University, Kattankulathur, Tamil Nadu 603203, India
| | - B J Kirby
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - S T Pantelides
- Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - A Y Borisevich
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S J May
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
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23
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Yi D, Lu N, Chen X, Shen S, Yu P. Engineering magnetism at functional oxides interfaces: manganites and beyond. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:443004. [PMID: 28745614 DOI: 10.1088/1361-648x/aa824d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The family of transition metal oxides (TMOs) is a large class of magnetic materials that has been intensively studied due to the rich physics involved as well as the promising potential applications in next generation electronic devices. In TMOs, the spin, charge, orbital and lattice are strongly coupled, and significant advances have been achieved to engineer the magnetism by different routes that manipulate these degrees of freedom. The family of manganites is a model system of strongly correlated magnetic TMOs. In this review, using manganites thin films and the heterostructures in conjunction with other TMOs as model systems, we review the recent progress of engineering magnetism in TMOs. We first discuss the role of the lattice that includes the epitaxial strain and the interface structural coupling. Then we look into the role of charge, focusing on the interface charge modulation. Having demonstrated the static effects, we continue to review the research on dynamical control of magnetism by electric field. Next, we review recent advances in heterostructures comprised of high T c cuprate superconductors and manganites. Following that, we discuss the emergent magnetic phenomena at interfaces between 3d TMOs and 5d TMOs with strong spin-orbit coupling. Finally, we provide our outlook for prospective future directions.
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Affiliation(s)
- Di Yi
- Geballe Laboratory for Advanced Materials and Applied Physics Department, Stanford University, Stanford, CA 94305, United States of America
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24
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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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25
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Interface-induced multiferroism by design in complex oxide superlattices. Proc Natl Acad Sci U S A 2017; 114:E5062-E5069. [PMID: 28607082 DOI: 10.1073/pnas.1706814114] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Interfaces between materials present unique opportunities for the discovery of intriguing quantum phenomena. Here, we explore the possibility that, in the case of superlattices, if one of the layers is made ultrathin, unexpected properties can be induced between the two bracketing interfaces. We pursue this objective by combining advanced growth and characterization techniques with theoretical calculations. Using prototype La2/3Sr1/3MnO3 (LSMO)/BaTiO3 (BTO) superlattices, we observe a structural evolution in the LSMO layers as a function of thickness. Atomic-resolution EM and spectroscopy reveal an unusual polar structure phase in ultrathin LSMO at a critical thickness caused by interfacing with the adjacent BTO layers, which is confirmed by first principles calculations. Most important is the fact that this polar phase is accompanied by reemergent ferromagnetism, making this system a potential candidate for ultrathin ferroelectrics with ferromagnetic ordering. Monte Carlo simulations illustrate the important role of spin-lattice coupling in LSMO. These results open up a conceptually intriguing recipe for developing functional ultrathin materials via interface-induced spin-lattice coupling.
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26
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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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27
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Grutter AJ, Vailionis A, Borchers JA, Kirby BJ, Flint CL, He C, Arenholz E, Suzuki Y. Interfacial Symmetry Control of Emergent Ferromagnetism at the Nanoscale. NANO LETTERS 2016; 16:5647-5651. [PMID: 27472285 DOI: 10.1021/acs.nanolett.6b02255] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The emergence of complex new ground states at interfaces has been identified as one of the most promising routes to highly tunable nanoscale materials. Despite recent progress, isolating and controlling the underlying mechanisms behind these emergent properties remains among the most challenging materials physics problems to date. In particular, generating ferromagnetism localized at the interface of two nonferromagnetic materials is of fundamental and technological interest. Moreover, the ability to turn the ferromagnetism on and off would shed light on the origin of such emergent phenomena and is promising for spintronic applications. We demonstrate that ferromagnetism confined within one unit cell at the interface of CaRuO3 and CaMnO3 can be switched on and off by changing the symmetry of the oxygen octahedra connectivity at the boundary. Interfaces that are symmetry-matched across the boundary exhibit interfacial CaMnO3 ferromagnetism while the ferromagnetism at symmetry-mismatched interfaces is suppressed. We attribute the suppression of ferromagnetic order to a reduction in charge transfer at symmetry-mismatched interfaces, where frustrated bonding weakens the orbital overlap. Thus, interfacial symmetry is a new route to control emergent ferromagnetism in materials such as CaMnO3 that exhibit antiferromagnetism in bulk form.
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Affiliation(s)
- A J Grutter
- Geballe Laboratory for Advanced Materials, Stanford University , Stanford, California 94305, United States
- NIST Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States
- Department of Materials Science and Engineering, University of California , Berkeley, California 94720, United States
| | - A Vailionis
- Geballe Laboratory for Advanced Materials, Stanford University , Stanford, California 94305, United States
| | - J A Borchers
- NIST Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States
| | - B J Kirby
- NIST Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States
| | - C L Flint
- Geballe Laboratory for Advanced Materials, Stanford University , Stanford, California 94305, United States
- Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States
| | - C He
- Department of Materials Science and Engineering, University of California , Berkeley, California 94720, United States
| | - E Arenholz
- Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Y Suzuki
- Geballe Laboratory for Advanced Materials, Stanford University , Stanford, California 94305, United States
- Department of Applied Physics, Stanford University , Stanford, California 94305, United States
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28
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Emerging magnetism and anomalous Hall effect in iridate-manganite heterostructures. Nat Commun 2016; 7:12721. [PMID: 27596572 PMCID: PMC5025866 DOI: 10.1038/ncomms12721] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 07/27/2016] [Indexed: 11/29/2022] Open
Abstract
Strong Coulomb repulsion and spin–orbit coupling are known to give rise to exotic physical phenomena in transition metal oxides. Initial attempts to investigate systems, where both of these fundamental interactions are comparably strong, such as 3d and 5d complex oxide superlattices, have revealed properties that only slightly differ from the bulk ones of the constituent materials. Here we observe that the interfacial coupling between the 3d antiferromagnetic insulator SrMnO3 and the 5d paramagnetic metal SrIrO3 is enormously strong, yielding an anomalous Hall response as the result of charge transfer driven interfacial ferromagnetism. These findings show that low dimensional spin–orbit entangled 3d–5d interfaces provide an avenue to uncover technologically relevant physical phenomena unattainable in bulk materials. Whilst superlattices containing thin films of 5d transition metal oxides are expected to yield strong interfacial coupling, only weak effects have been observed. Here, the authors report strong coupling between 3d SrMnO3 and 5d SrIrO3 due to the interplay of strong Coulomb and spin orbit interactions.
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29
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Lu XZ, Rondinelli JM. Epitaxial-strain-induced polar-to-nonpolar transitions in layered oxides. NATURE MATERIALS 2016; 15:951-955. [PMID: 27295100 DOI: 10.1038/nmat4664] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 05/13/2016] [Indexed: 06/06/2023]
Abstract
Epitaxial strain can induce collective phenomena and new functionalities in complex oxide thin films. Strong coupling between strain and polar lattice modes can stabilize new ferroelectric phases from nonpolar dielectrics or enhance electric polarizations and Curie temperatures. Recently, strain has also been exploited to induce novel metal-insulator transitions and magnetic reconstructions through its coupling to nonpolar modes, including rotations of BO6 transition-metal octahedra. Although large strains are thought to induce ferroelectricity, here we demonstrate a polar-to-nonpolar transition in (001) films of layered A3B2O7 hybrid-improper ferroelectrics with experimentally accessible biaxial strains. We show the origin of the transition originates from the interplay of trilinear-related lattice mode interactions active in the layered oxides, and those interactions are directly strain tunable. Our results call for a careful re-examination of the role of strain-polarization coupling in ferroelectric films with nontrivial anharmonicities and offer a route to search for new functionalities in layered oxides.
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Affiliation(s)
- Xue-Zeng Lu
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
| | - James M Rondinelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
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30
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Zhang H, Zhang J, Yang H, Lan Q, Hong D, Wang S, Shen X, Khan T, Yu R, Sun J, Shen B. Structural and Magnetic Properties of LaCoO3/SrTiO3 Multilayers. ACS APPLIED MATERIALS & INTERFACES 2016; 8:18328-18333. [PMID: 27377147 DOI: 10.1021/acsami.6b03756] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Structural and magnetic properties of the LaCoO3/SrTiO3 (LCO/STO) multilayers (MLs) with a fixed STO layer of 4 nm but varied LCO layer thicknesses have been systematically studied. The MLs grown on Sr0.7La0.3Al0.65Ta0.35O3 (LSAT) and SrTiO3 (STO) exhibit the in-plane lattice constant of the substrates, but those on LaAlO3 (LAO) show the in-plane lattice constant between those of the first two kinds of MLs. Compared with the LCO single layer (SL), the magnetic order of the MLs is significantly enhanced, as demonstrated by a very slow decrease, which is fast for the SL, of the Curie temperature and the saturation magnetization as the LCO layer thickness decreases. For example, clear ferromagnetic order is observed in the ML with the LCO layer of ∼1.5 nm, whereas it vanishes below ∼6 nm for the LCO SL. This result is consistent with the observation that the dark stripes, which are believed to be closely related to the magnetic order, remain clear in the MLs while they are vague in the corresponding LCO SL. The present work suggests a novel route to tune the magnetism of perovskite oxide films.
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Affiliation(s)
- Hongrui Zhang
- Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Jing Zhang
- Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Huaiwen Yang
- Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Qianqian Lan
- Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Deshun Hong
- Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Shufang Wang
- College of Physics Science and Technology, Hebei University , Baoding 071002, Hebei Province, People's Republic of China
| | - Xi Shen
- Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Tahira Khan
- Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Richeng Yu
- Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Jirong Sun
- Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Baogen Shen
- Beijing National Laboratory for Condensed Matter & Institute of Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
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31
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Piezoelectricity and rotostriction through polar and non-polar coupled instabilities in bismuth-based piezoceramics. Sci Rep 2016; 6:28742. [PMID: 27364037 PMCID: PMC4929446 DOI: 10.1038/srep28742] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 06/07/2016] [Indexed: 11/08/2022] Open
Abstract
Coupling of order parameters provides a means to tune functionality in advanced materials including multiferroics, superconductors, and ionic conductors. We demonstrate that the response of a frustrated ferroelectric state leads to coupling between order parameters under electric field depending on grain orientation. The strain of grains oriented along a specific crystallographic direction, 〈h00〉, is caused by converse piezoelectricity originating from a ferrodistortive tetragonal phase. For 〈hhh〉 oriented grains, the strain results from converse piezoelectricity and rotostriction, as indicated by an antiferrodistortive instability that promotes octahedral tilting in a rhombohedral phase. Both strain mechanisms combined lead to a colossal local strain of (2.4 ± 0.1) % and indicate coupling between oxygen octahedral tilting and polarization, here termed "rotopolarization". These findings were confirmed with electromechanical experiments, in situ neutron diffraction, and in situ transmission electron microscopy in 0.75Bi1/2Na1/2TiO3-0.25SrTiO3. This work demonstrates that polar and non-polar instabilities can cooperate to provide colossal functional responses.
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32
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33
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Atomic-scale control of magnetic anisotropy via novel spin-orbit coupling effect in La2/3Sr1/3MnO3/SrIrO3 superlattices. Proc Natl Acad Sci U S A 2016; 113:6397-402. [PMID: 27199482 DOI: 10.1073/pnas.1524689113] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Magnetic anisotropy (MA) is one of the most important material properties for modern spintronic devices. Conventional manipulation of the intrinsic MA, i.e., magnetocrystalline anisotropy (MCA), typically depends upon crystal symmetry. Extrinsic control over the MA is usually achieved by introducing shape anisotropy or exchange bias from another magnetically ordered material. Here we demonstrate a pathway to manipulate MA of 3d transition-metal oxides (TMOs) by digitally inserting nonmagnetic 5d TMOs with pronounced spin-orbit coupling (SOC). High-quality superlattices comprising ferromagnetic La2/3Sr1/3MnO3 (LSMO) and paramagnetic SrIrO3 (SIO) are synthesized with the precise control of thickness at the atomic scale. Magnetic easy-axis reorientation is observed by controlling the dimensionality of SIO, mediated through the emergence of a novel spin-orbit state within the nominally paramagnetic SIO.
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Liao Z, Huijben M, Zhong Z, Gauquelin N, Macke S, Green RJ, Van Aert S, Verbeeck J, Van Tendeloo G, Held K, Sawatzky GA, Koster G, Rijnders G. Controlled lateral anisotropy in correlated manganite heterostructures by interface-engineered oxygen octahedral coupling. NATURE MATERIALS 2016; 15:425-31. [PMID: 26950593 DOI: 10.1038/nmat4579] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 01/22/2016] [Indexed: 05/27/2023]
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35
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Gibert M, Viret M, Torres-Pardo A, Piamonteze C, Zubko P, Jaouen N, Tonnerre JM, Mougin A, Fowlie J, Catalano S, Gloter A, Stéphan O, Triscone JM. Interfacial Control of Magnetic Properties at LaMnO3/LaNiO3 Interfaces. NANO LETTERS 2015; 15:7355-7361. [PMID: 26484628 DOI: 10.1021/acs.nanolett.5b02720] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The functional properties of oxide heterostructures ultimately rely on how the electronic and structural mismatches occurring at interfaces are accommodated by the chosen materials combination. We discuss here LaMnO3/LaNiO3 heterostructures, which display an intrinsic interface structural asymmetry depending on the growth sequence. Using a variety of synchrotron-based techniques, we show that the degree of intermixing at the monolayer scale allows interface-driven properties such as charge transfer and the induced magnetic moment in the nickelate layer to be controlled. Further, our results demonstrate that the magnetic state of strained LaMnO3 thin films dramatically depends on interface reconstructions.
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Affiliation(s)
- M Gibert
- Département de Physique de la Matière Quantique, University of Geneva , Geneva, Switzerland
| | - M Viret
- Département de Physique de la Matière Quantique, University of Geneva , Geneva, Switzerland
- Service de Physique de l'Etat Condensé, CNRS URA 2464 , CEA Saclay, Gif-sur-Yvette, France
| | - A Torres-Pardo
- Laboratoire de Physique des Solides, University of Paris-Sud, CNRS-UMR 8502 , Orsay 91405, France
| | - C Piamonteze
- Swiss Light Source, Paul Scherrer Institute , 5232 Villigen-PSI, Switzerland
| | - P Zubko
- Département de Physique de la Matière Quantique, University of Geneva , Geneva, Switzerland
| | - N Jaouen
- Synchrotron SOLEIL , 91192 Gif-Sur-Yvette, France
| | | | - A Mougin
- Laboratoire de Physique des Solides, University of Paris-Sud, CNRS-UMR 8502 , Orsay 91405, France
| | - J Fowlie
- Département de Physique de la Matière Quantique, University of Geneva , Geneva, Switzerland
| | - S Catalano
- Département de Physique de la Matière Quantique, University of Geneva , Geneva, Switzerland
| | - A Gloter
- Laboratoire de Physique des Solides, University of Paris-Sud, CNRS-UMR 8502 , Orsay 91405, France
| | - O Stéphan
- Laboratoire de Physique des Solides, University of Paris-Sud, CNRS-UMR 8502 , Orsay 91405, France
| | - J-M Triscone
- Département de Physique de la Matière Quantique, University of Geneva , Geneva, Switzerland
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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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37
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Qiao L, Jang JH, Singh DJ, Gai Z, Xiao H, Mehta A, Vasudevan RK, Tselev A, Feng Z, Zhou H, Li S, Prellier W, Zu X, Liu Z, Borisevich A, Baddorf AP, Biegalski MD. Dimensionality Controlled Octahedral Symmetry-Mismatch and Functionalities in Epitaxial LaCoO₃/SrTiO₃ Heterostructures. NANO LETTERS 2015; 15:4677-84. [PMID: 26103204 DOI: 10.1021/acs.nanolett.5b01471] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Epitaxial strain provides a powerful approach to manipulate physical properties of materials through rigid compression or extension of their chemical bonds via lattice-mismatch. Although symmetry-mismatch can lead to new physics by stabilizing novel interfacial structures, challenges in obtaining atomic-level structural information as well as lack of a suitable approach to separate it from the parasitical lattice-mismatch have limited the development of this field. Here, we present unambiguous experimental evidence that the symmetry-mismatch can be strongly controlled by dimensionality and significantly impact the collective electronic and magnetic functionalities in ultrathin perovskite LaCoO3/SrTiO3 heterojunctions. State-of-art diffraction and microscopy reveal that symmetry breaking dramatically modifies the interfacial structure of CoO6 octahedral building-blocks, resulting in expanded octahedron volume, reduced covalent screening, and stronger electron correlations. Such phenomena fundamentally alter the electronic and magnetic behaviors of LaCoO3 thin-films. We conclude that for epitaxial systems, correlation strength can be tuned by changing orbital hybridization, thus affecting the Coulomb repulsion, U, instead of by changing the band structure as the common paradigm in bulks. These results clarify the origin of magnetic ordering for epitaxial LaCoO3 and provide a route to manipulate electron correlation and magnetic functionality by orbital engineering at oxide heterojunctions.
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Affiliation(s)
- Liang Qiao
- †School of Materials, The University of Manchester, Manchester, M13 9PL, United Kingdom
| | | | | | | | | | - Apurva Mehta
- ⊥Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | | | | | | | | | - Sean Li
- ○School of Materials Science and Engineering, University of New South Wales, Sydney, 2052, NSW Australia
| | - Wilfrid Prellier
- ◆Laboratoire CRISMAT, CNRS UMR 6508, ENSICAEN, Normandie Université, 6 Bd Maréchal Juin, F-14050 Caen Cedex 4, France
| | | | - Zijiang Liu
- ¶Department of Physics, Lanzhou City University, Lanzhou 730070, China
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Strain Engineering of Octahedral Rotations and Physical Properties of SrRuO3 Films. Sci Rep 2015; 5:10245. [PMID: 26018639 PMCID: PMC4446894 DOI: 10.1038/srep10245] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 04/08/2015] [Indexed: 11/08/2022] Open
Abstract
Strain engineering is an effective way to modify functional properties of thin films. Recently, the importance of octahedral rotations in pervoskite films has been recognized in discovering and designing new functional phases. Octahedral behavior of SrRuO3 film as a popular electrode in heterostructured devices is of particular interest for its probable interfacial coupling of octahedra with the functional overlayers. Here we report the strain engineering of octahedral rotations and physical properties that has been achieved in SrRuO3 films in response to the substrate-induced misfit strains of almost the same amplitude but of opposite signs. It shows that the compressively strained film on NdGaO3 substrate displays a rotation pattern of a tetragonal phase whilst the tensilely strained film on KTaO3 substrate has the rotation pattern of the bulk orthorhombic SrRuO3 phase. In addition, the compressively strained film displays a perpendicular magnetic anisotropy while the tensilely strained film has the magnetic easy axis lying in the film plane. The results show the prospect of strain engineered octahedral architecture in producing desired property and novel functionality in the class of perovskite material.
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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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