1
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Samoshkina Y, Rautskii M, Neznakhin D, Stepanova E, Andreev N, Chichkov V, Zaikovskii V, Chernichenko A. Strain-induced charge ordering above room temperature in rare-earth manganites. Dalton Trans 2024; 53:5721-5731. [PMID: 38450515 DOI: 10.1039/d3dt04299e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2024]
Abstract
Most known mixed manganites containing rare-earth elements demonstrate a pronounced charge ordering (CO) state below room temperature. The behavior of the magnetic susceptibility and electronic magnetic resonance of polycrystalline Pr1-xSrxMnO3/YSZ (x = 0.2 and x = 0.4) films without a pronounced texture indicates the formation of the CO phase in the samples at temperatures close to and above room temperature. Moreover, this phase manifests itself with a typical sign of martensitic transformation. The same phenomenon has been traced for textured polycrystalline La0.7Sr0.3MnO3/YSZ films. Electron microscope data indicate the presence of internal strain within the films, which is probably responsible for the formation of the CO phase. It is assumed that the reasons for the appearance of such strain include the crystallite size and the boundary between them. The results obtained provide the basis for the development of new research and technological tasks for the generation of the high-temperature CO state in various polycrystalline rare-earth manganites, since this state contributes to the manifestation of interesting magnetocaloric, magnetoelectric and multiferroic properties. In addition, recent data has opened up new opportunities for studying the strain-induced phenomena in such materials.
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Affiliation(s)
- Yu Samoshkina
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia.
| | - M Rautskii
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia.
| | - D Neznakhin
- Institute of Natural Sciences and Mathematics, Ural Federal University, Yekaterinburg 620002, Russia
| | - E Stepanova
- Institute of Natural Sciences and Mathematics, Ural Federal University, Yekaterinburg 620002, Russia
| | - N Andreev
- National University of Science and Technology (NUST "MISIS"), Moscow 119991, Russia
- Research and Education Center "Smart Materials and Biomedical Applications", Immanuel Kant Baltic Federal University, Kaliningrad 236041, Russia
| | - V Chichkov
- Research and Education Center "Smart Materials and Biomedical Applications", Immanuel Kant Baltic Federal University, Kaliningrad 236041, Russia
| | - V Zaikovskii
- Boreskov Institute of Catalysis, Novosibirsk, 630090, Russia
| | - A Chernichenko
- Moscow Technical University of Communication and Informatics, Moscow 111024, Russia
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2
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Lucas I, Marcano N, Prokscha T, Magén C, Corcuera R, Morellón L, De Teresa JM, Ibarra MR, Algarabel PA. Spin Glass State in Strained La 2/3Ca 1/3MnO 3 Thin Films. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3646. [PMID: 36296835 PMCID: PMC9609232 DOI: 10.3390/nano12203646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/07/2022] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
Epitaxial strain modifies the physical properties of thin films deposited on single-crystal substrates. In a previous work, we demonstrated that in the case of La2/3Ca1/3MnO3 thin films the strain induced by the substrate can produce the segregation of a non-ferromagnetic layer (NFL) at the top surface of ferromagnetic epitaxial La2/3Ca1/3MnO3 for a critical value of the tetragonality τ, defined as τ = |c - a|a, of τC ≈ 0.024. Although preliminary analysis suggested its antiferromagnetic nature, to date a complete characterization of the magnetic state of such an NFL has not been performed. Here, we present a comprehensive magnetic characterization of the strain-induced segregated NFL. The field-cooled magnetic hysteresis loops exhibit an exchange bias mechanism below T ≈ 80 K, which is well below the Curie temperature of the ferromagnetic La2/3Ca1/3MnO3 layer. The exchange bias and coercive fields decay exponentially with temperature, which is commonly accepted to describe spin-glass (SG) behavior. The signatures of slow dynamics were confirmed by slow spin relaxation over a wide temperature regime. Low-energy muon spectroscopy experiments directly evidence the slowing down of the magnetic moments below ~100 K in the NFL. The experimental results indicate the SG nature of the NFL. This SG state can be understood within the context of the competing ferromagnetic and antiferromagnetic interactions of similar energies.
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Affiliation(s)
- Irene Lucas
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - Noelia Marcano
- Centro Universitario de la Defensa, Academia General Militar, 50090 Zaragoza, Spain
| | - Thomas Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - César Magén
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, 50018 Zaragoza, Spain
| | - Rubén Corcuera
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - Luis Morellón
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - José M. De Teresa
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, 50018 Zaragoza, Spain
| | - M. Ricardo Ibarra
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, 50018 Zaragoza, Spain
| | - Pedro A. Algarabel
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
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3
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Lan Q, Wang C, Jin L, Schnedler M, Freter L, Fischer K, Caron J, Wei XK, Denneulin T, Kovács A, Ebert P, Zhong X, Dunin-Borkowski RE. Electrostatic Shaping of Magnetic Transition Regions in La_{0.7}Sr_{0.3}MnO_{3}. PHYSICAL REVIEW LETTERS 2022; 129:057201. [PMID: 35960587 DOI: 10.1103/physrevlett.129.057201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/21/2022] [Accepted: 06/24/2022] [Indexed: 06/15/2023]
Abstract
We report a magnetic transition region in La_{0.7}Sr_{0.3}MnO_{3} with gradually changing magnitude of magnetization, but no rotation, stable at all temperatures below T_{C}. Spatially resolved magnetization, composition and Mn valence data reveal that the magnetic transition region is induced by a subtle Mn composition change, leading to charge transfer at the interface due to carrier diffusion and drift. The electrostatic shaping of the magnetic transition region is mediated by the Mn valence, which affects both magnetization by Mn^{3+}-Mn^{4+} double exchange interaction and free carrier concentration.
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Affiliation(s)
- Qianqian Lan
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1) and Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
- National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - Chuanshou Wang
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China
| | - Lei Jin
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1) and Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Michael Schnedler
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1) and Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Lars Freter
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1) and Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Kurt Fischer
- Department of Mechanical and Electrical Engineering, National Institute of Technology, Tokuyama College, Gakuendai, Shunan, Yamaguchi, 745-8585, Japan
| | - Jan Caron
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1) and Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Xian-Kui Wei
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1) and Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Thibaud Denneulin
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1) and Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - András Kovács
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1) and Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Philipp Ebert
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1) and Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Xiaoyan Zhong
- TRACE EM Unit and Department of Materials Science and Engineering, City University of Hong Kong, Kowloon 999077, Hong Kong SAR, People's Republic of China
- City University of Hong Kong, Shenzhen Futian Research Institute, Shenzhen 518048, People's Republic of China
- Nanomanufacturing Laboratory, City University of Hong Kong, Shenzhen Research Institute, Shenzhen 518057, People's Republic of China
| | - Rafal E Dunin-Borkowski
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C 1) and Peter Grünberg Institut (PGI-5), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
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4
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Xu K, Lin T, Rao Y, Wang Z, Yang Q, Zhang H, Zhu J. Direct investigation of the atomic structure and decreased magnetism of antiphase boundaries in garnet. Nat Commun 2022; 13:3206. [PMID: 35680884 PMCID: PMC9184601 DOI: 10.1038/s41467-022-30992-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Accepted: 03/22/2022] [Indexed: 11/17/2022] Open
Abstract
The ferrimagnetic insulator iron garnets, tailored artificially with specific compositions, have been widely utilized in magneto-optical (MO) devices. The adjustment on synthesis always induces structural variation, which is underestimated due to the limited knowledge of the local structures. Here, by analyzing the structure and magnetic properties, two different antiphase boundaries (APBs) with individual interfacial structure are investigated in substituted iron garnet film. We reveal that magnetic signals decrease in the regions close to APBs, which implies degraded MO performance. In particular, the segregation of oxygen deficiencies across the APBs directly leads to reduced magnetic elements, further decreases the magnetic moment of Fe and results in a higher absorption coefficient close to the APBs. Furthermore, the formation of APBs can be eliminated by optimizing the growth rate, thus contributing to the enhanced MO performance. These analyses at the atomic scale provide important guidance for optimizing MO functional materials. Iron garnets are widely used in magneto-optical devices, but knowledge of the effects of common defects on performance is limited. Here, using high-resolution microscopy and spectroscopy, the authors find that magnetism is weakened near these defects causing reduced performance, but can be avoided by tuning the growth rate.
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Affiliation(s)
- Kun Xu
- National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, The State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials (MOE), Tsinghua University, Beijing, 100084, P.R. China.,Ji Hua Laboratory, Foshan, Guangdong, P.R. China.,Central Nano & Micro Mechanism, Beijing, Tsinghua University, Beijing, 100084, P.R. China
| | - Ting Lin
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, P.R. China
| | - Yiheng Rao
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, P.R. China.,Hubei Yangtze Memory Laboratories, Wuhan, 430205, P.R. China
| | - Ziqiang Wang
- National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, The State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials (MOE), Tsinghua University, Beijing, 100084, P.R. China
| | - Qinghui Yang
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, P.R. China
| | - Huaiwu Zhang
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, P.R. China
| | - Jing Zhu
- National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, The State Key Laboratory of New Ceramics and Fine Processing, Key Laboratory of Advanced Materials (MOE), Tsinghua University, Beijing, 100084, P.R. China. .,Ji Hua Laboratory, Foshan, Guangdong, P.R. China. .,Central Nano & Micro Mechanism, Beijing, Tsinghua University, Beijing, 100084, P.R. China.
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5
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Smari M, Hamdi R, Prado-Gonjal J, Cortés-Gil R, Dhahri E, Mompean F, García-Hernández M, Schmidt R. Magnetoimpedance spectroscopy of phase-separated La 0.5Ca 0.5MnO 3 polycrystalline manganites. Phys Chem Chem Phys 2020; 22:11625-11636. [PMID: 32405632 DOI: 10.1039/d0cp00794c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetoimpedance spectroscopy was carried out on phase-separated La0.5Ca0.5MnO3 polycrystalline manganites. The La0.5Ca0.5MnO3 powder was synthesized following an adapted sol-gel route. Structural and magnetic data showed the signs of phase coexistence of ferromagnetic (FM) Pnma and charge-ordered antiferromagnetic (CO-AFM) P21/m phases. Magnetization vs. temperature (M vs. T) measurements revealed several magnetic transitions from the high temperature paramagnetic (PM) to an FM phase upon cooling (PM-FM) at ≈240 K, FM-AFM (≈170 K) and AFM-FM (≈100 K). Magnetic field (H)-dependent impedance spectroscopy data were collected from sintered pellets and fitted with an equivalent circuit model to separately analyze the different dielectric contributions from the grain boundary (GB) and the grain interior bulk areas. This allowed separating the GB and bulk magnetoresistance (MR), which was shown to amount to a maximum of ≈80% for both GB and bulk at H = 10 T near the metal-insulator transition (MIT) at ≈100 K. The GB resistance was found to be larger than the bulk resistance by a factor of ≈3, which implies that the direct current (DC) resistance and DC MR are dominated by contributions from the GBs. The magnetocapacitance (MC) effects detected were all found to be small below ≈3%, including in the presence of a CO phase.
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Affiliation(s)
- Mourad Smari
- CICECO, Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal.
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6
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Ordóñez JE, Marín L, Rodríguez LA, Algarabel PA, Pardo JA, Guzmán R, Morellón L, Magén C, Snoeck E, Gómez ME, Ibarra MR. Observation of unexpected uniaxial magnetic anisotropy in La 2/3Sr 1/3MnO 3 films by a BaTiO 3 overlayer in an artificial multiferroic bilayer. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2020; 11:651-661. [PMID: 32363131 PMCID: PMC7176924 DOI: 10.3762/bjnano.11.51] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 03/23/2020] [Indexed: 06/11/2023]
Abstract
We studied in detail the in-plane magnetic properties of heterostructures based on a ferroelectric BaTiO3 overlayer deposited on a ferromagnetic La2/3Sr1/3MnO3 film grown epitaxially on pseudocubic (001)-oriented SrTiO3, (LaAlO3)0.3(Sr2TaAlO6)0.7 and LaAlO3 substrates. In this configuration, the combination of both functional perovskites constitutes an artificial multiferroic system with potential applications in spintronic devices based on the magnetoelectric effect. La2/3Sr1/3MnO3 single layers and BaTiO3/La2/3Sr1/3MnO3 bilayers using the pulsed-laser deposition technique. We analyzed the films structurally through X-ray reciprocal space maps and high-angle annular dark field microscopy, and magnetically via thermal demagnetization curves and in-plane magnetization versus applied magnetic field loops at room temperature. Our results indicate that the BaTiO3 layer induces an additional strain in the La2/3Sr1/3MnO3 layers close to their common interface. The presence of BaTiO3 on the surface of tensile-strained La2/3Sr1/3MnO3 films transforms the in-plane biaxial magnetic anisotropy present in the single layer into an in-plane uniaxial magnetic anisotropy. Our experimental evidence suggests that this change in the magnetic anisotropy only occurs in tensile-strained La2/3Sr1/3MnO3 film and is favored by an additional strain on the La2/3Sr1/3MnO3 layer promoted by the BaTiO3 film. These findings reveal an additional mechanism that alters the magnetic behavior of the ferromagnetic layer, and consequently, deserves further in-depth research to determine how it can modify the magnetoelectric coupling of this hybrid multiferroic system.
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Affiliation(s)
- John E Ordóñez
- Department of Physics, Universidad del Valle, A.A. 25360, Cali, Colombia
| | - Lorena Marín
- Department of Physics, Universidad del Valle, A.A. 25360, Cali, Colombia
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain
- Centro de Excelencia de Nuevos Materiales (CENM), Universidad del Valle, A.A. 25360, Cali, Colombia
| | - Luis A Rodríguez
- Department of Physics, Universidad del Valle, A.A. 25360, Cali, Colombia
- Centro de Excelencia de Nuevos Materiales (CENM), Universidad del Valle, A.A. 25360, Cali, Colombia
- Laboratorio de Microscopías Avanzadas (LMA)-Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain
- CEMES-CNRS, 29 rue Jeanne Marvig, B.P. 94347, F-31055 Toulouse Cedex, France
| | - Pedro A Algarabel
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - José A Pardo
- Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain
- Laboratorio de Microscopías Avanzadas (LMA)-Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
- Departamento de Ciencia y Tecnología de Materiales y Fluidos, Universidad de Zaragoza, 50018 Zaragoza, Spain
| | - Roger Guzmán
- Laboratorio de Microscopías Avanzadas (LMA)-Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain
| | - Luis Morellón
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - César Magén
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Laboratorio de Microscopías Avanzadas (LMA)-Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - Etienne Snoeck
- CEMES-CNRS, 29 rue Jeanne Marvig, B.P. 94347, F-31055 Toulouse Cedex, France
| | - María E Gómez
- Department of Physics, Universidad del Valle, A.A. 25360, Cali, Colombia
- Centro de Excelencia de Nuevos Materiales (CENM), Universidad del Valle, A.A. 25360, Cali, Colombia
| | - Manuel R Ibarra
- Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Laboratorio de Microscopías Avanzadas (LMA)-Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, 50018 Zaragoza, Spain
- Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
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7
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Vasić B, Konstantinović Z, Pannunzio-Miner E, Valencia S, Abrudan R, Gajić R, Pomar A. Nanoscale mechanical control of surface electrical properties of manganite films with magnetic nanoparticles. NANOSCALE ADVANCES 2019; 1:1763-1771. [PMID: 36134228 PMCID: PMC9418570 DOI: 10.1039/c8na00301g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 02/18/2019] [Indexed: 06/11/2023]
Abstract
Mechanical control of electrical properties in complex heterostructures, consisting of magnetic FeO x nanoparticles on top of manganite films, is achieved using atomic force microscope (AFM) based methods. Under applied pressure of the AFM tip, drop of the electrical conductivity is observed inducing an electrically insulating state upon a critical normal load. Current and surface potential maps suggest that the switching process is mainly governed by the flexoelectric field induced at the sample surface. The relaxation process of the electrical surface potential indicates that the diffusion of oxygen vacancies from the bulk of the manganite films towards the sample surface is the dominant relaxation mechanism. The magnetic FeO x nanoparticles, staying attached to the sample surface after the rubbing, protect the underlying manganite films and provide stability of the observed resistive switching effect. The employed mechanical control gives a new freedom in the design of resistive switching devices since it does not depend on the film thickness, and biasing is not needed.
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Affiliation(s)
- Borislav Vasić
- Graphene Laboratory of Center for Solid State Physics and New Materials, Institute of Physics Belgrade, University of Belgrade Pregrevica 118 11080 Belgrade Serbia
| | - Zorica Konstantinović
- Center for Solid State Physics and New Materials, Institute of Physics Belgrade, University of Belgrade Pregrevica 118 11080 Belgrade Serbia
| | - Elisa Pannunzio-Miner
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC Campus de la UAB 08193 Bellaterra Spain
| | - Sergio Valencia
- Helmholtz-Zentrum Berlin für Materialien und Energie Albert-Einstein-Str. 15 12489 Berlin Germany
| | - Radu Abrudan
- Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum 44780 Bochum Germany
| | - Radoš Gajić
- Graphene Laboratory of Center for Solid State Physics and New Materials, Institute of Physics Belgrade, University of Belgrade Pregrevica 118 11080 Belgrade Serbia
| | - Alberto Pomar
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC Campus de la UAB 08193 Bellaterra Spain
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8
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Yin X, Tang CS, Majidi MA, Ren P, Wang L, Yang P, Diao C, Yu X, Breese MBH, Wee ATS, Wang J, Rusydi A. Modulation of Manganite Nanofilm Properties Mediated by Strong Influence of Strontium Titanate Excitons. ACS APPLIED MATERIALS & INTERFACES 2018; 10:35563-35570. [PMID: 29210262 DOI: 10.1021/acsami.7b15347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Hole-doped perovskite manganites have attracted much attention because of their unique optical, electronic, and magnetic properties induced by the interplay between spin, charge, orbital, and lattice degrees of freedom. Here, a comprehensive investigation of the optical, electronic, and magnetic properties of La0.7Sr0.3MnO3 thin films on SrTiO3 (LSMO/STO) and other substrates is conducted using a combination of temperature-dependent transport, spectroscopic ellipsometry, X-ray absorption spectroscopy, and X-ray magnetic circular dichroism. A significant difference in the optical property of LSMO/STO that occurs even in thick (87.2 nm) LSMO/STO from that of LSMO on other substrates is discovered. Several excitonic features are observed in thin film nanostructure LSMO/STO at ∼4 eV, which could be attributed to the formation of anomalous charged excitonic complexes. On the basis of the spectral weight transfer analysis, anomalous excitonic effects from STO strengthen the electronic correlation in LSMO films. This results in the occurrence of optical spectral changes related to the intrinsic Mott-Hubbard properties in manganites. We find that while lattice strain from the substrate influences the optical properties of the LSMO thin films, the coexistence of strong electron-electron (e-e) and electron-hole (e-h) interactions which leads to the resonant excitonic effects from the substrate plays a much more significant role. Our result shows that the onset of anomalous excitonic dynamics in manganite oxides may potentially generate new approaches in manipulating exciton-based optoelectronic applications.
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Affiliation(s)
- Xinmao Yin
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , 117603 , Singapore
- SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering , Shenzhen University , Shenzhen 518060 , China
- Department of Physics, Faculty of Science , National University of Singapore , 117542 , Singapore
| | - Chi Sin Tang
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , 117603 , Singapore
- Department of Physics, Faculty of Science , National University of Singapore , 117542 , Singapore
- NUS Graduate School for Integrative Sciences and Engineering , 117456 , Singapore
| | - Muhammad Aziz Majidi
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , 117603 , Singapore
- Department of Physics, Faculty of Science , National University of Singapore , 117542 , Singapore
- Departemen Fisika, FMIPA , Universitas Indonesia , Depok 16424 , Indonesia
| | - Peng Ren
- School of Materials Science and Engineering , Nanyang Technological University , 639798 , Singapore
| | - Le Wang
- School of Materials Science and Engineering , Nanyang Technological University , 639798 , Singapore
| | - Ping Yang
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , 117603 , Singapore
| | - Caozheng Diao
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , 117603 , Singapore
| | - Xiaojiang Yu
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , 117603 , Singapore
| | - Mark B H Breese
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , 117603 , Singapore
- Department of Physics, Faculty of Science , National University of Singapore , 117542 , Singapore
| | - Andrew T S Wee
- Department of Physics, Faculty of Science , National University of Singapore , 117542 , Singapore
- NUS Graduate School for Integrative Sciences and Engineering , 117456 , Singapore
- Centre for Advanced 2D Materials and Graphene Research Centre , National University of Singapore , 117551 , Singapore
| | - Junling Wang
- School of Materials Science and Engineering , Nanyang Technological University , 639798 , Singapore
| | - Andrivo Rusydi
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , 117603 , Singapore
- NUSNNI-NanoCore , National University of Singapore , 117411 , Singapore
- Department of Physics, Faculty of Science , National University of Singapore , 117542 , Singapore
- NUS Graduate School for Integrative Sciences and Engineering , 117456 , Singapore
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9
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Oka D, Fukumura T. Crystal engineering for novel functionalities with oxide thin film epitaxy. CrystEngComm 2017. [DOI: 10.1039/c7ce00322f] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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10
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Yang S, Liu F, Wu C, Yang S. Tuning Surface Properties of Low Dimensional Materials via Strain Engineering. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:4028-4047. [PMID: 27376498 DOI: 10.1002/smll.201601203] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 05/26/2016] [Indexed: 06/06/2023]
Abstract
The promising and versatile applications of low dimensional materials are largely due to their surface properties, which along with their underlying electronic structures have been well studied. However, these materials may not be directly useful for applications requiring properties other than their natal ones. In recent years, strain has been shown to be an additionally useful handle to tune the physical and chemical properties of materials by changing their geometric and electronic structures. The strategies for producing strain are summarized. Then, the electronic structure of quasi-two dimensional layered non-metallic materials (e.g., graphene, MX2, BP, Ge nanosheets) under strain are discussed. Later, the strain effects on catalytic properties of metal-catalyst loaded with strain are focused on. Both experimental and computational perspectives for dealing with strained systems are covered. Finally, an outlook on engineering surface properties utilizing strain is provided.
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Affiliation(s)
- Shengchun Yang
- School of Science, MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Academy of Xi'an Jiaotong University, 215000, Suzhou, P. R. China
| | - Fuzhu Liu
- School of Science, MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Academy of Xi'an Jiaotong University, 215000, Suzhou, P. R. China
| | - Chao Wu
- Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, 710054, P. R. China
| | - Sen Yang
- School of Science, MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Academy of Xi'an Jiaotong University, 215000, Suzhou, P. R. China
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11
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Zheng D, Jin C, Li P, Wang L, Feng L, Mi W, Bai H. Orbital Reconstruction Enhanced Exchange Bias in La0.6Sr0.4MnO3/Orthorhombic YMnO3 Heterostructures. Sci Rep 2016; 6:24568. [PMID: 27090614 PMCID: PMC4836304 DOI: 10.1038/srep24568] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 03/29/2016] [Indexed: 11/12/2022] Open
Abstract
The exchange bias in ferromagnetic/multiferroic heterostructures is usually considered to originate from interfacial coupling. In this work, an orbital reconstruction enhanced exchange bias was discovered. As La0.6Sr0.4MnO3 (LSMO) grown on YMnO3 (YMO) suffers a tensile strain (a > c), the doubly degenerate eg orbital splits into high energy 3z2 − r2 and low energy x2 − y2 orbitals, which makes electrons occupy the localized x2 − y2 orbital and leads to the formation of antiferromagnetic phase in LSMO. The orbital reconstruction induced antiferromagnetic phase enhances the exchange bias in the LSMO/YMO heterostructures, lightening an effective way for electric-field modulated magnetic moments in multiferroic magnetoelectric devices.
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Affiliation(s)
- Dongxing Zheng
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, China
| | - Chao Jin
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, China
| | - Peng Li
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, China
| | - Liyan Wang
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, China
| | - Liefeng Feng
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, China
| | - Wenbo Mi
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, China
| | - Haili Bai
- Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Institute of Advanced Materials Physics, Faculty of Science, Tianjin University, Tianjin 300072, China
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