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Maznichenko IV, Ostanin S, Maryenko D, Dugaev VK, Sherman EY, Buczek P, Mertig I, Kawasaki M, Ernst A. Emerging Two-Dimensional Conductivity at the Interface between Mott and Band Insulators. PHYSICAL REVIEW LETTERS 2024; 132:216201. [PMID: 38856292 DOI: 10.1103/physrevlett.132.216201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 04/23/2024] [Indexed: 06/11/2024]
Abstract
Intriguingly, conducting perovskite interfaces between ordinary band insulators are widely explored, whereas similar interfaces with Mott insulators are still not quite understood. Here, we address the (001), (110), and (111) interfaces between the LaTiO_{3} Mott, and large band gap KTaO_{3} insulators. Based on first-principles calculations, we reveal a mechanism of interfacial conductivity, which is distinct from a formerly studied one applicable to interfaces between polar wideband insulators. Here, the key factor causing conductivity is the matching of oxygen octahedra tilting in KTaO_{3} and LaTiO_{3} which, due to a small gap in the LaTiO_{3} results in its sensitivity to the crystal structure, yields metallization of its overlayer and following charge transfer from Ti to Ta. Our findings, also applicable to other Mott insulators interfaces, shed light on the emergence of conductivity observed in LaTiO_{3}/KTaO_{3} (110) where the "polar" arguments are not applicable and on the emergence of superconductivity in these structures.
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Affiliation(s)
- I V Maznichenko
- Institute of Physics, Martin Luther University Halle-Wittenberg, D-06099 Halle, Germany
- Department of Engineering and Computer Sciences, Hamburg University of Applied Sciences, Berliner Tor 7, D-20099 Hamburg, Germany
| | - S Ostanin
- Institute of Physics, Martin Luther University Halle-Wittenberg, D-06099 Halle, Germany
| | - D Maryenko
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - V K Dugaev
- Department of Physics and Medical Engineering, Rzeszów University of Technology, 35-959 Rzeszów, Poland
| | - E Ya Sherman
- Department of Physical Chemistry and the EHU Quantum Center, University of the Basque Country UPV/EHU, Bilbao 48080, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, Spain
| | - P Buczek
- Department of Engineering and Computer Sciences, Hamburg University of Applied Sciences, Berliner Tor 7, D-20099 Hamburg, Germany
| | - I Mertig
- Institute of Physics, Martin Luther University Halle-Wittenberg, D-06099 Halle, Germany
| | - M Kawasaki
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Tokyo 113-8656, Japan
| | - A Ernst
- Institute for Theoretical Physics, Johannes Kepler University, A-4040 Linz, Austria
- Max Planck Institute for Microstructure Physics, Weinberg 2, D-06120 Halle, Germany
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2
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Dorini TT, Brix F, Chatelier C, Kokalj A, Gaudry É. Two-dimensional oxide quasicrystal approximants with tunable electronic and magnetic properties. NANOSCALE 2021; 13:10771-10779. [PMID: 34132718 DOI: 10.1039/d1nr02407h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Recently, the discovery of the quasiperiodic order in ultra-thin perovskite films reinvigorated the field of 2-dimensional oxides on metals, and raised the question of the reasons behind the emergence of the quasiperiodic order in these systems. The effect of size-mismatch between the two separate systems has been widely reported as a key factor governing the formation of new oxide structures on metals. Herein, we show that electronic effects can play an important role as well. To this end, the structural, thermodynamic, electronic and magnetic properties of freestanding two-dimensional oxide quasicrystalline approximants and their characteristics when deposited over metallic substrates are systematically investigated to unveil the structure-property relationships within the series. Our thermodynamic approach suggests that the formation of these aperiodic systems is likely for a wide range of compositions. In addition, the magnetic properties and work functions of the thin films can be controlled by tuning their chemical composition. This work provides well-founded general insights into the driving forces behind the emergence of the quasiperiodic order in ternary oxides grown on elemental metals and offers guidelines for the discovery of new oxide quasicrystalline ultra-thin films with interesting physical properties.
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3
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Pradhan DK, Kumari S, Rack PD. Magnetoelectric Composites: Applications, Coupling Mechanisms, and Future Directions. NANOMATERIALS 2020; 10:nano10102072. [PMID: 33092147 PMCID: PMC7589497 DOI: 10.3390/nano10102072] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 10/08/2020] [Accepted: 10/12/2020] [Indexed: 12/04/2022]
Abstract
Multiferroic (MF)-magnetoelectric (ME) composites, which integrate magnetic and ferroelectric materials, exhibit a higher operational temperature (above room temperature) and superior (several orders of magnitude) ME coupling when compared to single-phase multiferroic materials. Room temperature control and the switching of magnetic properties via an electric field and electrical properties by a magnetic field has motivated research towards the goal of realizing ultralow power and multifunctional nano (micro) electronic devices. Here, some of the leading applications for magnetoelectric composites are reviewed, and the mechanisms and nature of ME coupling in artificial composite systems are discussed. Ways to enhance the ME coupling and other physical properties are also demonstrated. Finally, emphasis is given to the important open questions and future directions in this field, where new breakthroughs could have a significant impact in transforming scientific discoveries to practical device applications, which can be well-controlled both magnetically and electrically.
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Affiliation(s)
- Dhiren K. Pradhan
- Department of Materials Science & Engineering, University of Tennessee, Knoxville, TN 37996, USA
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Correspondence: (D.K.P.); (P.D.R.)
| | - Shalini Kumari
- Department of Materials Science & Engineering, The Pennsylvania State University, University Park, PA 16802, USA;
| | - Philip D. Rack
- Department of Materials Science & Engineering, University of Tennessee, Knoxville, TN 37996, USA
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Correspondence: (D.K.P.); (P.D.R.)
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4
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Deleuze PM, Mahmoud A, Domenichini B, Dupont C. Theoretical investigation of the platinum substrate influence on BaTiO 3 thin film polarisation. Phys Chem Chem Phys 2019; 21:4367-4374. [PMID: 30724921 DOI: 10.1039/c8cp07022a] [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
Density functional theory calculations are performed to study the out-of-plane polarisation in BaTiO3 (BTO) thin films epitaxially grown on platinum. Prior to any polarisation calculation, the stability of the Pt(001)/BaTiO3(001) structure is thoroughly discussed. In particular, the nature of the Pt/BTO and BTO/vacuum interfaces is characterised. The growth of BTO is shown to start with a TiO2 layer while the nature of the surface termination does not broadly modify the stability. Therefore both upper terminations are considered when describing the ferroelectric behaviour in Pt/BTO interfaces. The geometric and electronic effects of the substrate on the polarisation are investigated. To isolate the electronic influence of platinum, the out-of-plane polarisation in Pt/BTO systems is compared to the one in isolated BTO slabs constrained to the same lattice mismatch induced by the epitaxial growth on platinum. The ferroelectric phase is favoured as soon as the thickness is larger than 23 Å, both for isolated and deposited BTO, for the smallest width. The Pt substrate will modify the size of polarisation domains, while an upper BaO layer through the use of asymmetric [TiO2/BaO] systems will induce an increase of the polarisation. One could take advantage of this experimentally.
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Affiliation(s)
- Pierre-Marie Deleuze
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université de Bourgogne Franche Comté, BP 47870, 21078 Dijon Cedex, France.
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5
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Amorim CO, Amaral JS, Gonçalves JN, Amaral VS. Electric Field Induced Room Temperature Null to High Spin State Switching: A Computational Prediction. ADVANCED THEORY AND SIMULATIONS 2019. [DOI: 10.1002/adts.201900005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Carlos O. Amorim
- Physics Department and CICECOUniversity of Aveiro 3810‐193 Aveiro Portugal
| | - João S. Amaral
- Physics Department and CICECOUniversity of Aveiro 3810‐193 Aveiro Portugal
| | - João N. Gonçalves
- Physics Department and CICECOUniversity of Aveiro 3810‐193 Aveiro Portugal
| | - Vítor S. Amaral
- Physics Department and CICECOUniversity of Aveiro 3810‐193 Aveiro Portugal
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6
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Barcaro G, Fortunelli A. 2D oxides on metal materials: concepts, status, and perspectives. Phys Chem Chem Phys 2019; 21:11510-11536. [DOI: 10.1039/c9cp00972h] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two-dimensional oxide-on-metal materials: concepts, methods, and link to technological applications, with 5 subtopics: structural motifs, robustness, catalysis, ternaries, and nanopatterning.
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7
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Piekarz P, Wiśniewski P, Derzsi M. Structural and electronic properties of Fe monolayer on BaTiO 3(0 0 1). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:365402. [PMID: 30063030 DOI: 10.1088/1361-648x/aad6f6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The structural, electronic, and phonon properties of the BaTiO3(0 0 1) surface and the Fe/BaTiO3(0 0 1) interface have been studied within the density functional theory. Attention is paid to the lattice instabilities (soft phonon modes) that induce ferroelectric distortions in the surface and the interface. A phonon-induced monoclinic (Cm) thin-film counterpart of the low-temperature rhombohedral (R3m) ferroelectric bulk BaTiO3 phase is found. The changes in crystal structure, electronic density of states, atomic charges, and magnetic moments associated with the ferroelectric distortions are discussed comparing the results of the standard GGA and the hybrid DFT calculations. The magnetoelectric coupling at the Fe/BaTiO3(0 0 1) interface is investigated by the analysis of changes in magnetic moments on Fe and Ti atoms induced by the atomic displacements perpendicular and parallel to the surface.
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Affiliation(s)
- Przemysław Piekarz
- Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, PL-31342 Kraków, Poland
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8
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Borisov V, Ostanin S, Mertig I. Multiferroic properties of the PbTiO 3/La 2/3Sr 1/3MnO 3 interface studied from first principles. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:175801. [PMID: 28240599 DOI: 10.1088/1361-648x/aa6318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Magnetoelectric coupling and spin polarization at the multiferroic PbTiO3/La2/3Sr1/3MnO3 (PTO/LSMO) interface is studied from first principles in view of the recent experimental observation of the tunneling magnetoresistance sign inversion in Co/PZT/LSMO tunnel junctions (Pantel et al 2012 Nat. Mater. 11 289). Our results confirm the stabilization of the locally antiferromagnetic order in the manganite when the PTO polarization points away from the LSMO side, which changes the interface magnetization by 6.3-6.9 [Formula: see text] per surface unit cell in agreement with previous studies. We contribute by analyzing the charge transfer from the half-metallic LSMO side which induces metallicity and local magnetic moments in the interface PTO layers. This results in either p- or n-doped conductive behavior, depending on the polarization direction. Electronic correlations were determined to qualitatively change the picture for certain configurations, as far as the magnetic phase transition in the manganite and the spin character of the interface states are concerned. Most importantly, depending on the interface termination, the spin polarization of the PTO/LSMO interface is positive for one polarization state of PTO and acquires a 'spin-valve' character upon the ferroelectric switching.
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Affiliation(s)
- Vladislav Borisov
- Institute of Physics, Martin Luther University Halle-Wittenberg, D-06099 Halle, Germany
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9
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Wang XG, Sukhov A, Chotorlishvili L, Jia CL, Guo GH, Berakdar J. Electrically driven magnetic antenna based on multiferroic composites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:095804. [PMID: 28004643 DOI: 10.1088/1361-648x/aa5562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We suggest and demonstrate via large scale numerical simulations an electrically operated spin-wave inducer based on composite multiferroic junctions. Specifically, we consider an interfacially coupled ferromagnetic/ferroelectric structure that emits controllably spin waves in the ferromagnets if the ferroelectric polarization is poled by an external electric field. The roles of geometry and material properties are discussed.
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Affiliation(s)
- X-G Wang
- Institut für Physik, Martin-Luther Universität Halle-Wittenberg, 06099 Halle (Saale), Germany
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10
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Borek S, Braun J, Minár J, Kutnyakhov D, Elmers HJ, Schönhense G, Ebert H. Determination of surface and interface magnetic properties for the multiferroic heterostructure Co/BaTiO3 using spleed and arpes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:436004. [PMID: 27603180 DOI: 10.1088/0953-8984/28/43/436004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Co/BaTiO3(0 0 1) is one of the most interesting multiferroic heterostructures as it combines different ferroic phases, setting this way the fundamentals for innovative technical applications. Various theoretical approaches have been applied to investigate the electronic and magnetic properties of Co/BaTiO3(0 0 1). Here we determine the magnetic properties of 3 ML Co/BaTiO3 by calculating spin-polarized electron diffraction as well as angle-resolved photoemission spectra, with both methods being well established as surface sensitive techniques. Furthermore, we discuss the impact of altering the BaTiO3 polarization on the spectra and ascribe the observed changes to characteristic details of the electronic structure.
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Affiliation(s)
- St Borek
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
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11
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Yu L, Gao G, Ding G, Duan Y, Liu Y, He Y, Yao K. Prediction of large magnetoelectric coupling in Fe 4N/BaTiO 3 and MnFe 3N/BaTiO 3 junctions from a first-principles study. RSC Adv 2016. [DOI: 10.1039/c6ra00044d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The large magnetoelectric effects are predicted in Fe4N/BaTiO3 and MnFe3N/BaTiO3 junctions.
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Affiliation(s)
- Li Yu
- School of Physics and Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
- Department of Basics
| | - Guoying Gao
- School of Physics and Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Guangqian Ding
- School of Physics and Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Yongfa Duan
- Department of Basics
- Air Force Early Warning Academy
- Wuhan 430019
- China
| | - Yang Liu
- Department of Basics
- Air Force Early Warning Academy
- Wuhan 430019
- China
| | - Yan He
- Department of Basics
- Air Force Early Warning Academy
- Wuhan 430019
- China
| | - Kailun Yao
- School of Physics and Wuhan National High Magnetic Field Center
- Huazhong University of Science and Technology
- Wuhan 430074
- China
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12
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Taniyama T. Electric-field control of magnetism via strain transfer across ferromagnetic/ferroelectric interfaces. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:504001. [PMID: 26613163 DOI: 10.1088/0953-8984/27/50/504001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
By taking advantage of the coupling between magnetism and ferroelectricity, ferromagnetic (FM)/ferroelectric (FE) multiferroic interfaces play a pivotal role in manipulating magnetism by electric fields. Integrating the multiferroic heterostructures into spintronic devices significantly reduces energy dissipation from Joule heating because only an electric field is required to switch the magnetic element. New concepts of storage and processing of information thus can be envisioned when the electric-field control of magnetism is a viable alternative to the traditional current based means of controlling magnetism. This article reviews some salient aspects of the electric-field effects on magnetism, providing a short overview of the mechanisms of magneto-electric (ME) coupling at the FM/FE interfaces. A particular emphasis is placed on the ME effect via interfacial magneto-elastic coupling arising from strain transfer from the FE to FM layer. Recent results that demonstrate the electric-field control of magnetic anisotropy, magnetic order, magnetic domain wall motion, and etc are described. Obstacles that need to be overcome are also discussed for making this a reality for future device applications.
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Affiliation(s)
- Tomoyasu Taniyama
- Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan
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13
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Amorim CO, Figueiras F, Amaral JS, Vaghefi PM, Tavares PB, Correia MR, Baghizadeh A, Alves E, Rocha J, Amaral VS. Peculiar Magnetoelectric Coupling in BaTiO₃:Fe₁₁₃ ppm Nanoscopic Segregations. ACS APPLIED MATERIALS & INTERFACES 2015; 7:24741-24747. [PMID: 26480219 DOI: 10.1021/acsami.5b07462] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report polycrystalline BaTiO3 with cooperative magnetization behavior associated with the scarce presence of about 113 atomic ppm of Fe ions, clearly displaying magnetoelectric coupling with significant changes in magnetization (up to ΔM/M ≈ 32%) at the ferroelectric transitions. We find that Fe ions are segregated mostly at the interfaces between grain boundaries and an Fe-rich phase, forming a self-composite with high magnetoelectric coupling above room temperature. We compare our results with ab initio calculations and other experimental results found in the literature, proposing mechanisms that could be behind the magnetoelectric coupling within the ferroelectric matrix. These findings open the way for further strategies to optimize interfacial magnetoelectric couplings.
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Affiliation(s)
| | - F Figueiras
- IFIMUP-IN, Science Faculty; Porto University , 4169-007 Porto, Portugal
| | - J S Amaral
- IFIMUP-IN, Science Faculty; Porto University , 4169-007 Porto, Portugal
| | | | - P B Tavares
- Chemistry Center, Trás-os-Montes and Alto-Douro University , 5001-801 Vila Real, Portugal
| | | | | | - E Alves
- C2TN, Instituto Superior Técnico , Campus Tecnológico e Nuclear, EN10, 2695-066 Bobadela LRS, Portugal
| | - J Rocha
- C2TN, Instituto Superior Técnico , Campus Tecnológico e Nuclear, EN10, 2695-066 Bobadela LRS, Portugal
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14
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Hoffmann M, Borek S, Maznichenko IV, Ostanin S, Fischer G, Geilhufe M, Hergert W, Mertig I, Ernst A, Chassé A. Study of electronic and magnetic properties and related x-ray absorption spectroscopy of ultrathin Co films on BaTiO3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:426003. [PMID: 26443038 DOI: 10.1088/0953-8984/27/42/426003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present a first-principles study of electronic and magnetic properties of thin Co films on a BaTiO3(0 0 1) single crystal. The crystalline structure of 1-3 monolayer thick Co films was determined and served as input for calculations of the electronic and magnetic properties of the films. The estimation of exchange constants indicates that the Co films are ferromagnetic with a high critical temperature, which depends on the film thickness and the interface geometry. In addition, we calculated x-ray absorption spectra, related magnetic circular dichroism (XMCD) and linear dichroism (XLD) of the Co L 2, 3 edges as a function of Co film thickness and ferroelectric polarization of BaTiO3. We found characteristic features, which depend strongly on the magnetic properties and the structure of the film. While there is only a weak dependence of XMCD spectra on the ferroelectric polarization, the XLD of the films is much more sensitive to the polarization switching, which could possibly be observed experimentally.
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Affiliation(s)
- M Hoffmann
- Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany. Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
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15
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Borisov V, Ostanin S, Mertig I. Two-dimensional electron gas and its electric control at the interface between ferroelectric and antiferromagnetic insulator studied from first principles. Phys Chem Chem Phys 2015; 17:12812-25. [DOI: 10.1039/c4cp05831c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using first-principles methods we demonstrate the possibility of using the ferroelectric polarization to create and control a two-dimensional electron gas at a multiferroic oxide interface.
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Affiliation(s)
- Vladislav Borisov
- Institute of Physics
- Martin Luther University Halle-Wittenberg
- 06099 Halle
- Germany
- Max Planck Institute of Microstructure Physics
| | - Sergey Ostanin
- Max Planck Institute of Microstructure Physics
- 06120 Halle
- Germany
| | - Ingrid Mertig
- Institute of Physics
- Martin Luther University Halle-Wittenberg
- 06099 Halle
- Germany
- Max Planck Institute of Microstructure Physics
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16
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Fang YW, Ding HC, Tong WY, Zhu WJ, Shen X, Gong SJ, Wan XG, Duan CG. First-principles studies of multiferroic and magnetoelectric materials. Sci Bull (Beijing) 2015. [DOI: 10.1007/s11434-014-0628-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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17
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Wei T, Jia C. Multiferroic Dynamics of an Electric Field-Driven Composite Ferroelectric/Ferromagnetic Chain. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2014. [DOI: 10.1007/s13369-014-1186-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Cherifi RO, Ivanovskaya V, Phillips LC, Zobelli A, Infante IC, Jacquet E, Garcia V, Fusil S, Briddon PR, Guiblin N, Mougin A, Ünal AA, Kronast F, Valencia S, Dkhil B, Barthélémy A, Bibes M. Electric-field control of magnetic order above room temperature. NATURE MATERIALS 2014; 13:345-351. [PMID: 24464245 DOI: 10.1038/nmat3870] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Accepted: 12/18/2013] [Indexed: 06/03/2023]
Abstract
Controlling magnetism by means of electric fields is a key issue for the future development of low-power spintronics. Progress has been made in the electrical control of magnetic anisotropy, domain structure, spin polarization or critical temperatures. However, the ability to turn on and off robust ferromagnetism at room temperature and above has remained elusive. Here we use ferroelectricity in BaTiO3 crystals to tune the sharp metamagnetic transition temperature of epitaxially grown FeRh films and electrically drive a transition between antiferromagnetic and ferromagnetic order with only a few volts, just above room temperature. The detailed analysis of the data in the light of first-principles calculations indicate that the phenomenon is mediated by both strain and field effects from the BaTiO3. Our results correspond to a magnetoelectric coupling larger than previous reports by at least one order of magnitude and open new perspectives for the use of ferroelectrics in magnetic storage and spintronics.
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Affiliation(s)
- R O Cherifi
- 1] Unité Mixte de Physique CNRS/Thales, 1 av. Fresnel, 91767 Palaiseau & Université Paris-Sud, Orsay 91405, France [2]
| | - V Ivanovskaya
- Unité Mixte de Physique CNRS/Thales, 1 av. Fresnel, 91767 Palaiseau & Université Paris-Sud, Orsay 91405, France
| | - L C Phillips
- Unité Mixte de Physique CNRS/Thales, 1 av. Fresnel, 91767 Palaiseau & Université Paris-Sud, Orsay 91405, France
| | - A Zobelli
- Laboratoire de Physique des Solides, Université Paris-Sud, CNRS UMR 8502, Orsay 91405, France
| | - I C Infante
- Laboratoire SPMS, UMR 8580, Ecole Centrale Paris-CNRS, Grande voie des vignes, Châtenay-Malabry 92290, France
| | - E Jacquet
- Unité Mixte de Physique CNRS/Thales, 1 av. Fresnel, 91767 Palaiseau & Université Paris-Sud, Orsay 91405, France
| | - V Garcia
- Unité Mixte de Physique CNRS/Thales, 1 av. Fresnel, 91767 Palaiseau & Université Paris-Sud, Orsay 91405, France
| | - S Fusil
- 1] Unité Mixte de Physique CNRS/Thales, 1 av. Fresnel, 91767 Palaiseau & Université Paris-Sud, Orsay 91405, France [2] Université d'Evry-Val d'Essonne, Bd. F. Mitterrand, Evry cedex 91025, France
| | - P R Briddon
- School of Electrical and Electronic Engineering, University of Newcastle, Newcastle upon Tyne, NE 1 7RU, UK
| | - N Guiblin
- Laboratoire SPMS, UMR 8580, Ecole Centrale Paris-CNRS, Grande voie des vignes, Châtenay-Malabry 92290, France
| | - A Mougin
- Laboratoire de Physique des Solides, Université Paris-Sud, CNRS UMR 8502, Orsay 91405, France
| | - A A Ünal
- Helmholtz-Zentrum Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - F Kronast
- Helmholtz-Zentrum Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - S Valencia
- Helmholtz-Zentrum Berlin für Materialen und Energie, Albert-Einstein-Strasse 15, Berlin 12489, Germany
| | - B Dkhil
- Laboratoire SPMS, UMR 8580, Ecole Centrale Paris-CNRS, Grande voie des vignes, Châtenay-Malabry 92290, France
| | - A Barthélémy
- Unité Mixte de Physique CNRS/Thales, 1 av. Fresnel, 91767 Palaiseau & Université Paris-Sud, Orsay 91405, France
| | - M Bibes
- Unité Mixte de Physique CNRS/Thales, 1 av. Fresnel, 91767 Palaiseau & Université Paris-Sud, Orsay 91405, France
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19
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Hu JM, Shu L, Li Z, Gao Y, Shen Y, Lin YH, Chen LQ, Nan CW. Film size-dependent voltage-modulated magnetism in multiferroic heterostructures. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2014; 372:20120444. [PMID: 24421375 PMCID: PMC3895976 DOI: 10.1098/rsta.2012.0444] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The electric-voltage-modulated magnetism in multiferroic heterostructures, also known as the converse magnetoelectric (ME) coupling, has drawn increasing research interest recently owing to its great potential applications in future low-power, high-speed electronic and/or spintronic devices, such as magnetic memory and computer logic. In this article, based on combined theoretical analysis and experimental demonstration, we investigate the film size dependence of such converse ME coupling in multiferroic magnetic/ferroelectric heterostructures, as well as exploring the interaction between two relating coupling mechanisms that are the interfacial strain and possibly the charge effects. We also briefly discuss some issues for the next step and describe new device prototypes that can be enabled by this technology.
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Affiliation(s)
- J.-M. Hu
- Department of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
| | - L. Shu
- Department of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
| | - Z. Li
- Department of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
| | - Y. Gao
- Department of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
| | - Y. Shen
- Department of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
| | - Y. H. Lin
- Department of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
| | - L. Q. Chen
- Department of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA 16802, USA
| | - C. W. Nan
- Department of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China
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20
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Sukhov A, Horley P, Jia CL, Chotorlishvili L, Berakdar J. Finite-size effects on the magnetoelectric coupling in a ferroelectric/ferromagnetic structure revealed by ferromagnetic resonance. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20147509001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Chotorlishvili L, Khomeriki R, Sukhov A, Ruffo S, Berakdar J. Dynamics of localized modes in a composite multiferroic chain. PHYSICAL REVIEW LETTERS 2013; 111:117202. [PMID: 24074117 DOI: 10.1103/physrevlett.111.117202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 08/19/2013] [Indexed: 06/02/2023]
Abstract
In a coupled ferroelectric-ferromagnetic system, i.e., a composite multiferroic, the propagation of magnetic or ferroelectric excitations across the whole structure is a key issue for applications. Of special interest is the dynamics of localized magnetic or ferroelectric modes (LM) across the ferroelectric-ferromagnetic interface, particularly when the LM's carrier frequency is in the band of the ferroelectric and in the band gap of the ferromagnet. For a proper choice of the system's parameters, we find that there is a threshold amplitude above which the interface becomes transparent and an in-band ferroelectric LM penetrates the ferromagnetic array. Below that threshold, the LM is fully reflected. Slightly below this transmission threshold, the addition of noise may lead to energy transmission, provided that the noise level is neither too low nor too high, an effect that resembles stochastic resonance. These findings represent an important step towards the application of ferroelectric and/or ferromagnetic LM-based logic.
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Affiliation(s)
- L Chotorlishvili
- Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06120 Halle/Saale, Germany
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22
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Meyerheim HL, Ernst A, Mohseni K, Maznichenko IV, Henk J, Ostanin S, Jedrecy N, Klimenta F, Zegenhagen J, Schlueter C, Mertig I, Kirschner J. Tuning the structure of ultrathin BaTiO3 films on Me(001) (Me=Fe, Pd, Pt) surfaces. PHYSICAL REVIEW LETTERS 2013; 111:105501. [PMID: 25166678 DOI: 10.1103/physrevlett.111.105501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2012] [Revised: 03/01/2013] [Indexed: 06/03/2023]
Abstract
Using surface x-ray diffraction in combination with ab initio calculations, we demonstrate that the atomic structure of ultrathin BaTiO3 (BTO) films grown on Me(001) surfaces (Me=Fe, Pd, Pt) depends on subtle modifications of the interface chemical composition. A complete reversal of the surface termination from a BaO- [BTO on Fe(001)] to a TiO2-terminated film [BTO on Pt(001)] is observed which goes in parallel with the adsorption of submonolayer amounts of oxygen at metal hollow sites of the interface. Our results may suggest a new route to an overall control of both the surface and the interface geometry in BaTiO3/metal contacts.
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Affiliation(s)
- H L Meyerheim
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| | - A Ernst
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany and Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstraße 2, 04103 Leipzig, Germany
| | - K Mohseni
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| | - I V Maznichenko
- Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - J Henk
- Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - S Ostanin
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| | - N Jedrecy
- Institut des Nano Sciences de Paris, UPMC-Sorbonne Universités, CNRS-UMR7588, 75005 Paris, France
| | - F Klimenta
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| | - J Zegenhagen
- ESRF, Boîte Postale 220, F-38043 Grenoble Cedex, France
| | - C Schlueter
- ESRF, Boîte Postale 220, F-38043 Grenoble Cedex, France
| | - I Mertig
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany and Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - J Kirschner
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany and Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
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23
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Vaz CAF. Electric field control of magnetism in multiferroic heterostructures. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:333201. [PMID: 22824827 DOI: 10.1088/0953-8984/24/33/333201] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We review the recent developments in the electric field control of magnetism in multiferroic heterostructures, which consist of heterogeneous materials systems where a magnetoelectric coupling is engineered between magnetic and ferroelectric components. The magnetoelectric coupling in these composite systems is interfacial in origin, and can arise from elastic strain, charge, and exchange bias interactions, with different characteristic responses and functionalities. Moreover, charge transport phenomena in multiferroic heterostructures, where both magnetic and ferroelectric order parameters are used to control charge transport, suggest new possibilities to control the conduction paths of the electron spin, with potential for device applications.
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Affiliation(s)
- C A F Vaz
- SwissFEL, Paul Scherrer Institut, Villigen PSI, Switzerland.
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24
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Lukashev PV, Burton JD, Jaswal SS, Tsymbal EY. Ferroelectric control of the magnetocrystalline anisotropy of the Fe/BaTiO(3)(001) interface. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:226003. [PMID: 22551672 DOI: 10.1088/0953-8984/24/22/226003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Density-functional calculations are employed to investigate the effect of ferroelectric polarization of BaTiO(3) on the magnetocrystalline anisotropy of the Fe /BaTiO(3)(001) interface. It is found that the interface magnetocrystalline anisotropy energy changes from 1.33 to 1.02 erg cm (-2) when the ferroelectric polarization is reversed. This strong magnetoelectric coupling is explained in terms of the changing population of the Fe 3d orbitals at the Fe/BaTiO(3) interface driven by polarization reversal. Our results indicate that the electronically assisted magnetoelectric effects at the ferromagnetic/ferroelectric interfaces may be a viable alternative to the strain mediated coupling in related heterostructures and the electric field-induced effects on the interface magnetic anisotropy in ferromagnet/dielectric structures.
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Affiliation(s)
- Pavel V Lukashev
- Department of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588-0299, USA.
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25
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Fechner M, Zahn P, Ostanin S, Bibes M, Mertig I. Switching magnetization by 180° with an electric field. PHYSICAL REVIEW LETTERS 2012; 108:197206. [PMID: 23003084 DOI: 10.1103/physrevlett.108.197206] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Indexed: 06/01/2023]
Abstract
Magnetoelectric coupling allows for manipulating the magnetization by an external electric field or the electrical polarization by an external magnetic field. Here, we propose a mechanism to electrically induce 180° magnetization switching combining two effects: the magnetoelectric coupling at a multiferroic interface and magnetic interlayer exchange coupling. By means of first-principles methods, we investigate a ferroelectric layer in contact with a Fe/Au/Fe trilayer. The calculations show that the interface magnetism is strongly coupled to the ferroelectric layer. Furthermore, under certain conditions a reversal of polarization causes a sign reversal of the interlayer exchange coupling which is results in a 180° switching of the free layer magnetization. We argue that this magnetoelectric coupling mechanism is very robust and can find applications in magnetic data storage.
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Affiliation(s)
- M Fechner
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany.
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26
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Höfer A, Fechner M, Duncker K, Hölzer M, Mertig I, Widdra W. Persistence of surface domain structures for a bulk ferroelectric above TC. PHYSICAL REVIEW LETTERS 2012; 108:087602. [PMID: 22463573 DOI: 10.1103/physrevlett.108.087602] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Indexed: 05/31/2023]
Abstract
Photoemission electron microscopy performed on a well-prepared surface of BaTiO3 reveals the persistence of surface domains at temperatures well above the bulk Curie temperature. Their patterns follow the ferroelectric domain structure observed at 300 K. The contrast between formerly outward polarized domains and in-plane polarized domains is preserved across the transition, while the contrast of inward polarized domains changes sign. The work functions of different possible structures are compared by first-principles calculations. The domain contrast in photoemission above the bulk Curie temperature is associated with a remaining tetragonal distortion of the topmost unit cells which is stabilized by an ionic surface relaxation.
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Affiliation(s)
- A Höfer
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany.
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27
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Förster S, Meinel K, Schindler KM, Widdra W. Oxygen-deficient ordered phases of ultrathin BaTiO3 films on Pt(111). SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.4812] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Stefan Förster
- Institute of Physics; Martin-Luther-Universität Halle-Wittenberg; Halle; Germany
| | - Klaus Meinel
- Institute of Physics; Martin-Luther-Universität Halle-Wittenberg; Halle; Germany
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