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Aguilera-Del-Toro RH, Arruabarrena M, Leonardo A, Ayuela A. Magnetic order and magnetic anisotropy in two-dimensional ilmenenes. NANOSCALE ADVANCES 2023; 5:2813-2819. [PMID: 37205290 PMCID: PMC10187031 DOI: 10.1039/d3na00134b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 04/10/2023] [Indexed: 05/21/2023]
Abstract
Iron ilmenene is a new two-dimensional material that has recently been exfoliated from the naturally occurring iron titanate found in ilmenite ore, a material that is abundant on the earth's surface. In this work, we theoretically investigate the structural, electronic and magnetic properties of 2D transition-metal-based ilmenene-like titanates. The study of magnetic order reveals that these ilmenenes usually present intrinsic antiferromagnetic coupling between the 3d magnetic metals decorating both sides of the Ti-O layer. Furthermore, the ilmenenes based on late 3d brass metals, such as CuTiO3 and ZnTiO3, become ferromagnetic and spin compensated, respectively. Our calculations which include spin-orbit coupling reveal that the magnetic ilmenenes have large magnetocrystalline anisotropy energies when the 3d shell departs from being either filled or half-filled, with their spin orientation being out-of-plane for elements below half-filling of 3d states and in-plane above. These interesting magnetic properties of ilmenenes make them useful for future spintronic applications because they could be synthesized as already realized in the iron case.
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Affiliation(s)
- R H Aguilera-Del-Toro
- Donostia International Physics Center (DIPC) 20018 Donostia Spain
- Centro de Física de Materiales - Materials Physics Center (CFM-MPC) 20018 Donostia Spain
| | - M Arruabarrena
- Centro de Física de Materiales - Materials Physics Center (CFM-MPC) 20018 Donostia Spain
| | - A Leonardo
- Donostia International Physics Center (DIPC) 20018 Donostia Spain
- EHU Quantum Center, Universidad del País Vasco/Euskal Herriko Unibertsitatea UPV/EHU Leioa Spain
| | - A Ayuela
- Donostia International Physics Center (DIPC) 20018 Donostia Spain
- Centro de Física de Materiales - Materials Physics Center (CFM-MPC) 20018 Donostia Spain
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2
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Guasco L, Khaydukov Y, Kim G, Keller T, Vorobiev A, Devishvili A, Wochner P, Christiani G, Logvenov G, Keimer B. Emergent Magnetic Fan Structures in Manganite Homojunction Arrays. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2202971. [PMID: 35817958 DOI: 10.1002/adma.202202971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 06/27/2022] [Indexed: 06/15/2023]
Abstract
Devices with tunable magnetic noncollinearity are important components of superconducting electronics and spintronics, but they typically require epitaxial integration of several complex materials. The spin-polarized neutron reflectometry measurements on La1-x Srx MnO3 homojunction arrays with modulated Sr concentration reported herein have led to the discovery of magnetic fan structures with highly noncollinear alignment of Mn spins and an emergent periodicity twice as large as the array's unit cell. The neutron data show that these magnetic superstructures can be fully long-range ordered, despite the gradual modulation of the doping level created by charge transfer and chemical intermixing. The degree of noncollinearity can be effectively adjusted by low magnetic fields. Notwithstanding their chemical and structural simplicity, oxide homojunctions thus show considerable promise as a platform for tunable complex magnetism and as a powerful design element of spintronic devices.
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Affiliation(s)
- Laura Guasco
- Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569, Stuttgart, Germany
- Max Planck Society Outstation at the Heinz Maier-Leibnitz Zentrum (MLZ), D-85748, Garching, Germany
| | - Yury Khaydukov
- Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569, Stuttgart, Germany
- Max Planck Society Outstation at the Heinz Maier-Leibnitz Zentrum (MLZ), D-85748, Garching, Germany
| | - Gideok Kim
- Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569, Stuttgart, Germany
| | - Thomas Keller
- Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569, Stuttgart, Germany
- Max Planck Society Outstation at the Heinz Maier-Leibnitz Zentrum (MLZ), D-85748, Garching, Germany
| | - Alexei Vorobiev
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, Grenoble Cedex 9, F-38042, France
- Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala, 751 20, Sweden
| | - Anton Devishvili
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, Grenoble Cedex 9, F-38042, France
- Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala, 751 20, Sweden
| | - Peter Wochner
- Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569, Stuttgart, Germany
| | - Georg Christiani
- Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569, Stuttgart, Germany
| | - Gennady Logvenov
- Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569, Stuttgart, Germany
| | - Bernhard Keimer
- Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569, Stuttgart, Germany
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Catalano S, Gibert M, Fowlie J, Íñiguez J, Triscone JM, Kreisel J. Rare-earth nickelates RNiO 3: thin films and heterostructures. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2018; 81:046501. [PMID: 29266004 DOI: 10.1088/1361-6633/aaa37a] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This review stands in the larger framework of functional materials by focussing on heterostructures of rare-earth nickelates, described by the chemical formula RNiO3 where R is a trivalent rare-earth R = La, Pr, Nd, Sm, …, Lu. Nickelates are characterized by a rich phase diagram of structural and physical properties and serve as a benchmark for the physics of phase transitions in correlated oxides where electron-lattice coupling plays a key role. Much of the recent interest in nickelates concerns heterostructures, that is single layers of thin film, multilayers or superlattices, with the general objective of modulating their physical properties through strain control, confinement or interface effects. We will discuss the extensive studies on nickelate heterostructures as well as outline different approaches to tuning and controlling their physical properties and, finally, review application concepts for future devices.
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Affiliation(s)
- S Catalano
- DQMP, Université de Genève, 24 Quai Ernest-Ansermet, 1211 Geneva, Switzerland
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4
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Atomic-scale engineering of oxide interfaces yields a new family of synthetic magnetic structures. Sci Bull (Beijing) 2017; 62:1169-1170. [PMID: 36659507 DOI: 10.1016/j.scib.2017.08.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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5
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Chen B, Xu H, Ma C, Mattauch S, Lan D, Jin F, Guo Z, Wan S, Chen P, Gao G, Chen F, Su Y, Wu W. All-oxide–based synthetic antiferromagnets exhibiting layer-resolved magnetization reversal. Science 2017; 357:191-194. [DOI: 10.1126/science.aak9717] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Accepted: 06/07/2017] [Indexed: 11/02/2022]
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6
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Interlayer coupling through a dimensionality-induced magnetic state. Nat Commun 2016; 7:11227. [PMID: 27079668 PMCID: PMC4835538 DOI: 10.1038/ncomms11227] [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: 08/05/2015] [Accepted: 02/25/2016] [Indexed: 11/14/2022] Open
Abstract
Dimensionality is known to play an important role in many compounds for which
ultrathin layers can behave very differently from the bulk. This is especially true
for the paramagnetic metal LaNiO3, which can become insulating and
magnetic when only a few monolayers thick. We show here that an induced
antiferromagnetic order can be stabilized in the [111] direction by
interfacial coupling to the insulating ferromagnet LaMnO3, and used to
generate interlayer magnetic coupling of a nature that depends on the exact number
of LaNiO3 monolayers. For 7-monolayer-thick
LaNiO3/LaMnO3 superlattices, negative and positive
exchange bias, as well as antiferromagnetic interlayer coupling are observed in
different temperature windows. All three behaviours are explained based on the
emergence of a (¼,¼,¼)-wavevector antiferromagnetic structure
in LaNiO3 and the presence of interface asymmetry with LaMnO3.
This dimensionality-induced magnetic order can be used to tailor a broad range of
magnetic properties in well-designed superlattice-based devices. Oxide materials can be combined to create heterostructures exhibiting
complex properties not found in either substance individually. Here, the authors observe
antiferromagnetic interlayer exchange coupling between ferromagnetic lanthanum manganite
and nominally paramagnetic lanthanum nickel oxide.
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7
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Harada T, Ohkubo I, Lippmaa M, Sakurai Y, Matsumoto Y, Muto S, Koinuma H, Oshima M. Spin-filter tunnel junction with matched fermi surfaces. PHYSICAL REVIEW LETTERS 2012; 109:076602. [PMID: 23006390 DOI: 10.1103/physrevlett.109.076602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Indexed: 06/01/2023]
Abstract
Efficient injection of spin-polarized current into a semiconductor is a basic prerequisite for building semiconductor-based spintronic devices. Here, we use inelastic electron tunneling spectroscopy to show that the efficiency of spin-filter-type spin injectors is limited by spin scattering of the tunneling electrons. By matching the Fermi-surface shapes of the current injection source and target electrode material, spin injection efficiency can be significantly increased in epitaxial ferromagnetic insulator tunnel junctions. Our results demonstrate that not only structural but also Fermi-surface matching is important to suppress scattering processes in spintronic devices.
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Affiliation(s)
- T Harada
- Department of Applied Chemistry, The University of Tokyo, Hongo, Bunkyo-ku, Japan
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8
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Gibert M, Zubko P, Scherwitzl R, Iñiguez J, Triscone JM. Exchange bias in LaNiO3-LaMnO3 superlattices. NATURE MATERIALS 2012; 11:195-198. [PMID: 22266467 DOI: 10.1038/nmat3224] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Accepted: 12/01/2011] [Indexed: 05/31/2023]
Abstract
The wide spectrum of exotic properties exhibited by transition-metal oxides stems from the complex competition between several quantum interactions. The capacity to select the emergence of specific phases at will is nowadays extensively recognized as key for the design of diverse new devices with tailored functionalities. In this context, interface engineering in complex oxide heterostructures has developed into a flourishing field, enabling not only further tuning of the exceptional properties of these materials, but also giving access to hidden phases and emergent physical phenomena. Here we demonstrate how interfacial interactions can induce a complex magnetic structure in a non-magnetic material. We specifically show that exchange bias can unexpectedly emerge in heterostructures consisting of paramagnetic LaNiO3 (LNO) and ferromagnetic LaMnO3 (LMO). The observation of exchange bias in (111)-oriented LNO-LMO superlattices, manifested as a shift of the magnetization-field loop, not only implies the development of interface-induced magnetism in the paramagnetic LNO layers, but also provides us with a very subtle tool for probing the interfacial coupling between the LNO and LMO layers. First-principles calculations indicate that this interfacial interaction may give rise to an unusual spin order, resembling a spin-density wave, within the LNO layers.
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Affiliation(s)
- Marta Gibert
- Département de Physique de la Matière Condensée, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Genève 4, Switzerland.
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9
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Ilyasov VV, Velikokhatskii DA, Ershov IV, Nikiforov IY, Zhdanova TP. Ab initio calculations of chemical bond parameters and the band structure of a two-dimensional system: Graphene/MnO(001). J STRUCT CHEM+ 2011. [DOI: 10.1134/s0022476611050027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Allub R, Fuhr JD, Avignon M, Alascio B. The effect of Coulomb interaction at ferromagnetic-paramagnetic metallic perovskite junctions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:026005. [PMID: 21813998 DOI: 10.1088/0953-8984/21/2/026005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We study the effect of Coulomb interactions in transition metal oxide junctions. In this paper we analyze charge transfer at the interface of a three layer ferromagnetic-paramagnetic-ferromagnetic metallic oxide system. We choose a charge model considering a few atomic planes within each layer and obtain results for the magnetic coupling between the ferromagnetic layers. For large numbers of planes in the paramagnetic spacer we find that the coupling oscillates with the same period as in Ruderman-Kittel-Kasuya-Yoshida (RKKY) theory but the amplitude is sensitive to the Coulomb energy. At small spacer thickness however, large differences may appear as a function of the number of electrons per atom in the ferromagnetic and paramagnetic materials, the dielectric constant at each component, and the charge defects at the interface plane, emphasizing the effects of charge transfer.
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Affiliation(s)
- R Allub
- Centro Atómico Bariloche, (8400) S. C. de Bariloche, Argentina
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11
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Bowen M, Maurice JL, Barthélémy A, Bibes M, Imhoff D, Bellini V, Bertacco R, Wortmann D, Seneor P, Jacquet E, Vaurès A, Humbert J, Contour JP, Colliex C, Blügel S, Dederichs PH. Using half-metallic manganite interfaces to reveal insights into spintronics. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2007; 19:315208. [PMID: 21694108 DOI: 10.1088/0953-8984/19/31/315208] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A half-metal has been defined as a material with propagating electron states at the Fermi energy only for one of the two possible spin projections, and as such has been promoted as an interesting research direction for spin electronics. This review details recent advances on manganite thin film research within the field of spintronics, before presenting the structural, electronic and spin-polarized solid-state tunnelling transport studies that we have performed on heterostructures involving La(2/3)Sr(1/3)MnO(3) thin films separated by SrTiO(3) barriers. These experiments demonstrate that, with a polarization of spin [Formula: see text] electrons at the Fermi level that can reach 99%, the La(2/3)Sr(1/3)MnO(3)/SrTiO(3) interface for all practical purposes exhibits half-metallic behaviour. We offer insight into the electronic structure of the interface, including the electronic symmetry of any remaining spin [Formula: see text] states at the Fermi level. Finally, we present experiments that use the experimental half-metallic property of manganites as tools to reveal novel features of spintronics.
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Affiliation(s)
- M Bowen
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS-ULP, 23 rue du Loess BP 43, 67034 Strasbourg, France. Unité Mixte de Physique CNRS/Thales, Route Départementale 128, 91767 Palaiseau Cedex, France
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12
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Krivorotov IN, Nikolaev KR, Dobin AY, Goldman AM, Dahlberg ED. Exchange field induced magnetoresistance in colossal magnetoresistance manganites. PHYSICAL REVIEW LETTERS 2001; 86:5779-5782. [PMID: 11415356 DOI: 10.1103/physrevlett.86.5779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2000] [Indexed: 05/23/2023]
Abstract
The effect of an exchange field on the electrical transport in thin films of metallic ferromagnetic manganites has been investigated. The exchange field was induced both by direct exchange coupling in a ferromagnet/antiferromagnet multilayer and by indirect exchange interaction in a ferromagnet/paramagnet metallic superlattice. The electrical resistance of the metallic manganite layers was found to be determined by the magnitude of the vector sum of the effective exchange field and the external magnetic field.
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Affiliation(s)
- I N Krivorotov
- School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, Minnesota 55455, USA
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