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Li T, Deng S, Liu H, Chen J. Insights into Strain Engineering: From Ferroelectrics to Related Functional Materials and Beyond. Chem Rev 2024; 124:7045-7105. [PMID: 38754042 DOI: 10.1021/acs.chemrev.3c00767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Ferroelectrics have become indispensable components in various application fields, including information processing, energy harvesting, and electromechanical conversion, owing to their unique ability to exhibit electrically or mechanically switchable polarization. The distinct polar noncentrosymmetric lattices of ferroelectrics make them highly responsive to specific crystal structures. Even slight changes in the lattice can alter the polarization configuration and response to external fields. In this regard, strain engineering has emerged as a prevalent regulation approach that not only offers a versatile platform for structural and performance optimization within ferroelectrics but also unlocks boundless potential in various functional materials. In this review, we systematically summarize the breakthroughs in ferroelectric-based functional materials achieved through strain engineering and progress in method development. We cover research activities ranging from fundamental attributes to wide-ranging applications and novel functionalities ranging from electromechanical transformation in sensors and actuators to tunable dielectric materials and information technologies, such as transistors and nonvolatile memories. Building upon these achievements, we also explore the endeavors to uncover the unprecedented properties through strain engineering in related chemical functionalities, such as ferromagnetism, multiferroicity, and photoelectricity. Finally, through discussions on the prospects and challenges associated with strain engineering in the materials, this review aims to stimulate the development of new methods for strain regulation and performance boosting in functional materials, transcending the boundaries of ferroelectrics.
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Affiliation(s)
- Tianyu Li
- Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Shiqing Deng
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Hui Liu
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Jun Chen
- Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Hainan University, Haikou 570228, China
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2
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Biswas S, Naushad N, S K, Kamble VB. Resistive Avalanches in La 1-xSr xCoO 3-δ ( x = 0, 0.3) Thin Films and Their Reversible Evolution by Tuning Lattice Oxygen Vacancies (δ). ACS MATERIALS AU 2024; 4:308-323. [PMID: 38737118 PMCID: PMC11083121 DOI: 10.1021/acsmaterialsau.3c00101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/18/2024] [Accepted: 01/23/2024] [Indexed: 05/14/2024]
Abstract
Strong correlations are often manifested by exotic electronic phases and phase transitions. LaCoO3-δ (LCO) is a system that exhibits such strong electronic correlations with lattice-spin-charge-orbital degrees of freedom. Here, we show that mesoscopic oxygen-deficient LCO films show resistive avalanches of about 2 orders of magnitude due to the metal-insulator transition (MIT) of the film at about 372 K for the 25 W RF power-deposited LCO film on the Si/SiO2 substrate. In bulk, this transition is otherwise gradual and occurs over a very large temperature range. In thin films of LCO, the oxygen deficiency (0 < δ < 0.5) is more easily reversibly tuned, resulting in avalanches. The avalanches disappear after vacuum annealing, and the films behave like normal insulators (δ ∼0.5) with Co2+ in charge ordering alternatively with Co3+. This oxidation state change induces spin state crossovers that result in a spin blockade in the insulating phase, while the conductivity arises from hole hopping among the allowed cobalt Co4+ ion spin states at high temperature. The chemical pressure (strain) of 30% Sr2+ doping at the La3+ site results in reduction in the avalanche magnitude as well as their retention in subsequent heating cycles. The charge nonstoichiometry arising due to Sr2+ doping is found to contribute toward hole doping (i.e., Co3+ oxidation to Co4+) and thereby the retention of the hole percolation pathway. This is also manifested in energies of crossover from the 3D variable range hopping (VRH) type transport observed in the temperature range of 300-425 K, while small polaron hopping (SPH) is observed in the temperature range of 600-725 K for LCO. On the other hand, Sr-doped LCO does not show any crossover and only the VRH type of transport. The strain due to Sr2+ doping refrains the lattice from complete conversion of δ going to 0.5, retaining the avalanches.
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Affiliation(s)
- Soumya Biswas
- School of Physics, Indian Institute
of Science Education and Research, Thiruvananthapuram 695551, India
| | - Noora Naushad
- School of Physics, Indian Institute
of Science Education and Research, Thiruvananthapuram 695551, India
| | - Kalyani S
- School of Physics, Indian Institute
of Science Education and Research, Thiruvananthapuram 695551, India
| | - Vinayak B. Kamble
- School of Physics, Indian Institute
of Science Education and Research, Thiruvananthapuram 695551, India
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3
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Wu M, Shi J, Sa N, Wu R, Deng T, Yang R, Zhang KHL, Han P, Wang HQ, Kang J. Ferromagnetic Insulating Ground-State Resolved in Mixed Protons and Oxygen Vacancies-Doped La 0.67Sr 0.33CoO 3 Thin Films via Ionic Liquid Gating. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38624095 DOI: 10.1021/acsami.4c00724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
The realization of ferromagnetic insulating ground state is a critical prerequisite for spintronic applications. By applying electric field-controlled ionic liquid gating (ILG) to stoichiometry La0.67Sr0.33CoO3 thin films, the doping of protons (H+) has been achieved for the first time. Furthermore, a hitherto-unreported ferromagnetic insulating phase with a remarkably high Tc up to 180 K has been observed which can be attributed to the doping of H+ and the formation of oxygen vacancies (VO). The chemical formula of the dual-ion migrated film has been identified as La2/3Sr1/3CoO8/3H2/3 based on combined Co L23-edge absorption spectra and configuration interaction cluster calculations, from which we are able to explain the ferromagnetic ground state in terms of the distinct magnetic moment contributions from Co ions with octahedral (Oh) and tetrahedral (Td) symmetries following antiparallel spin alignments. Further density functional theory calculations have been performed to verify the functionality of H+ as the transfer ion and the origin of the novel ferromagnetic insulating ground state. Our results provide a fundamental understanding of the ILG regulation mechanism and shed light on the manipulating of more functionalities in other correlated compounds through dual-ion manipulation.
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Affiliation(s)
- Meng Wu
- Fujian Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, and Department of Physics, Xiamen University, Xiamen 361005, P.R. China
| | - Jueli Shi
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P.R. China
| | - Na Sa
- Fujian Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, and Department of Physics, Xiamen University, Xiamen 361005, P.R. China
| | - Ruoyu Wu
- Department of Physics, Beijing Key Lab for Metamaterials and Devices, Capital Normal University, Beijing 100048, P.R. China
| | - Tielong Deng
- Fujian Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, and Department of Physics, Xiamen University, Xiamen 361005, P.R. China
| | - Renqi Yang
- Fujian Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, and Department of Physics, Xiamen University, Xiamen 361005, P.R. China
| | - Kelvin H L Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P.R. China
| | - Peng Han
- Department of Physics, Beijing Key Lab for Metamaterials and Devices, Capital Normal University, Beijing 100048, P.R. China
| | - Hui-Qiong Wang
- Fujian Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, and Department of Physics, Xiamen University, Xiamen 361005, P.R. China
| | - Junyong Kang
- Fujian Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, and Department of Physics, Xiamen University, Xiamen 361005, P.R. China
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4
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Chen S, Chang J, Zhang Q, Li Q, Lin T, Meng F, Huang H, Si Y, Zeng S, Yin X, Duong MN, Lu Y, Chen L, Guo E, Chen H, Chang C, Kuo C, Chen Z. Spin State Disproportionation in Insulating Ferromagnetic LaCoO 3 Epitaxial Thin Films. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2303630. [PMID: 37485810 PMCID: PMC10520649 DOI: 10.1002/advs.202303630] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 06/30/2023] [Indexed: 07/25/2023]
Abstract
The origin of insulating ferromagnetism in epitaxial LaCoO3 films under tensile strain remains elusive despite extensive research efforts are devoted. Surprisingly, the spin state of its Co ions, the main parameter of its ferromagnetism, is still to be determined. Here, the spin state in epitaxial LaCoO3 thin films is systematically investigated to clarify the mechanism of strain-induced ferromagnetism using element-specific X-ray absorption spectroscopy and dichroism. Combining with the configuration interaction cluster calculations, it is unambiguously demonstrated that Co3+ in LaCoO3 films under compressive strain (on LaAlO3 substrate) is practically a low-spin state, whereas Co3+ in LaCoO3 films under tensile strain (on SrTiO3 substrate) have mixed high-spin and low-spin states with a ratio close to 1:3. From the identification of this spin state ratio, it is inferred that the dark strips observed by high-resolution scanning transmission electron microscopy indicate the position of Co3+ high-spin state, i.e., an observation of a spin state disproportionation in tensile-strained LaCoO3 films. This consequently explains the nature of ferromagnetism in LaCoO3 films. The study highlights the importance of spin state degrees of freedom, along with thin-film strain engineering, in creating new physical properties that do not exist in bulk materials.
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Affiliation(s)
- Shanquan Chen
- School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen518055China
| | - Jhong‐Yi Chang
- Department of ElectrophysicsNational Yang Ming Chiao Tung UniversityHsinchu30010Taiwan
| | - Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing100190China
| | - Qiuyue Li
- Department of Electronic ScienceEast China Normal UniversityShanghai200241China
- NYU‐ECNU Institute of PhysicsNYU ShanghaiShanghai200124China
| | - Ting Lin
- Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing100190China
| | - Fanqi Meng
- Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing100190China
| | - Haoliang Huang
- Hefei National Research Center for Physical Sciences at the Microscale and Anhui Laboratory of Advanced Photon Science and TechnologyUniversity of Science and Technology of ChinaHefei230026China
| | - Yangyang Si
- School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen518055China
| | - Shengwei Zeng
- Department of PhysicsFaculty of ScienceNational University of SingaporeSingapore117551Singapore
| | - Xinmao Yin
- Shanghai Key Laboratory of High Temperature SuperconductorsPhysics DepartmentShanghai UniversityShanghai200444China
| | - My Ngoc Duong
- Department of ElectrophysicsNational Yang Ming Chiao Tung UniversityHsinchu30010Taiwan
| | - Yalin Lu
- Hefei National Research Center for Physical Sciences at the Microscale and Anhui Laboratory of Advanced Photon Science and TechnologyUniversity of Science and Technology of ChinaHefei230026China
| | - Lang Chen
- Department of PhysicsSouthern University of Science and TechnologyShenzhen518055China
| | - Er‐Jia Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing100190China
| | - Hanghui Chen
- NYU‐ECNU Institute of PhysicsNYU ShanghaiShanghai200124China
- Department of PhysicsNew York UniversityNew YorkNY10012USA
| | - Chun‐Fu Chang
- Max‐Planck Institute for Chemical Physics of SolidsNöthnitzer Str. 4001187DresdenGermany
| | - Chang‐Yang Kuo
- Department of ElectrophysicsNational Yang Ming Chiao Tung UniversityHsinchu30010Taiwan
- National Synchrotron Radiation Research Center101 Hsin‐Ann RoadHsinchu30076Taiwan
| | - Zuhuang Chen
- School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen518055China
- Flexible Printed Electronics Technology CenterHarbin Institute of TechnologyShenzhen518055China
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5
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Zhang B, Yang P, Ding J, Chen J, Chow GM. Anisotropic Melting Path of Charge-Ordering Insulator in LSMO/STO Superlattice. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2203933. [PMID: 36461732 PMCID: PMC9896059 DOI: 10.1002/advs.202203933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 10/17/2022] [Indexed: 06/17/2023]
Abstract
Multiple phases coexist in manganite with simultaneously active couplings, and the transition among them depends on the relative intensities of different interactions. However, the melting path with variable intensities is unclear. The concentration and the ordering of oxygen vacancy in previous work are found to induce ferromagnetic charge-ordering insulator phase in [(La0.7 Sr0.3 MnO3 )10 /(SrTiO3 )5 ]n superlattice, which translates into metallic phase with magnetic field H and temperature T. In the current work, the H-T phase diagram for current I//[100] and I//[110] shows a large difference with H normal to the film plane, which is ascribed to the response of a variable range of hopping process to H with the in-plane anisotropic hopping probability of charge carrier. With H rotating from the out-of-plane to the in-plane direction, the preferred occupancy of the 3 d z 2 - r 2 $3{d}_{{z}^2 - {r}^2}$ orbital causes a decrease of spin-orbital coupling and lowers the activation energy, inducing a gentler melting process of a charge-ordering insulator. This work shows that the melting path of a charge-ordering insulator phase can be largely modulated in manganite with anisotropy.
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Affiliation(s)
- Bangmin Zhang
- Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesCentre for Physical Mechanics and BiophysicsSchool of PhysicsSun Yat‐sen UniversityGuangzhou510275China
| | - Ping Yang
- Singapore Synchrotron Light Source (SSLS)National University of Singapore5 Research LinkSingapore117603Singapore
| | - Jun Ding
- Department of Materials Science & EngineeringNational University of Singapore9 Engineering Drive 1Singapore117576Singapore
| | - Jingsheng Chen
- Department of Materials Science & EngineeringNational University of Singapore9 Engineering Drive 1Singapore117576Singapore
| | - Gan Moog Chow
- Department of Materials Science & EngineeringNational University of Singapore9 Engineering Drive 1Singapore117576Singapore
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6
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Liu J, Zhang X, Ji Y, Gao X, Wu J, Zhang M, Li L, Liu X, Yan W, Yao T, Yin Y, Wang L, Guo H, Cheng G, Wang Z, Gao P, Wang Y, Chen K, Liao Z. Controllable Itinerant Ferromagnetism in Weakly Correlated 5d SrIrO 3. J Phys Chem Lett 2022; 13:11946-11954. [PMID: 36534070 DOI: 10.1021/acs.jpclett.2c03313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The weakly correlated nature of 5d oxide SrIrO3 determines its rare ferromagnetism, and the control of its magnetic order is even less studied. Tailoring structure distortion is currently a main route to tune the magnetic order of 5d iridates, but only for the spatially confined insulating counterparts. Here, we have realized ferromagnetic order in metallic SrIrO3 by construction of SrIrO3/ferromagnetic-insulator (LaCoO3) superlattices, which reveal a giant coercivity of ∼10 T and saturation field of ∼25 T with strong perpendicular magnetic anisotropy. The Curie temperature of SrIrO3 can be controlled by engineering interface charge transfer, which is confirmed by Hall effect measurements collaborating with EELS and XAS. Besides, the noncoplanar spin texture is captured, which is caused by interfacial Dzyaloshinskii-Moriya interactions as well. These results indicate controllable itinerant ferromagnetism and an emergent topological magnetic state in strong spin-orbit coupled semimetal SrIrO3, showing great potential to develop efficient spintronic devices.
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Affiliation(s)
- Junhua Liu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230026, China
| | - Xinxin Zhang
- International Center for Quantum Materials and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing100871, China
| | - Yaoyao Ji
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230026, China
| | - Xiaofei Gao
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230026, China
| | - Jiating Wu
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei230031, China
| | - Minjie Zhang
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei230031, China
| | - Lin Li
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230026, China
| | - Xiaokang Liu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230026, China
| | - Wensheng Yan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230026, China
| | - Tao Yao
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230026, China
| | - Yuewei Yin
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei230026, China
- Department of Physics and CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, University of Science and Technology of China, Hefei230026, China
| | - Lingfei Wang
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei230026, China
| | - Hangwen Guo
- State Key Laboratory of Surface Physics and Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai200433, China
| | - Guanglei Cheng
- CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics, University of Science and Technology of China, Hefei230026, China
| | - Zhaosheng Wang
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei230031, China
| | - Peng Gao
- International Center for Quantum Materials and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing100871, China
| | - Yilin Wang
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei230026, China
| | - Kai Chen
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230026, China
| | - Zhaoliang Liao
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230026, China
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7
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Dai S, Xu L, Han K, Chen P, Wang K, Huang Z, Wu W, Chen F. Anomalous Lattice Evolution-Mediated Electrical Properties in Transparent KNN-Based Lead-Free Ferroelectric Films. Inorg Chem 2022; 61:19399-19406. [DOI: 10.1021/acs.inorgchem.2c03198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Song Dai
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
| | - Liqiang Xu
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
| | - Kun Han
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
| | - Pingfan Chen
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
| | - Ke Wang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Zhen Huang
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
- Stony Brook Institute at Anhui University, Anhui University, Hefei 230039, China
| | - Wenbin Wu
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Condition, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui 230031, China
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
| | - Feng Chen
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Condition, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui 230031, China
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8
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Chen S, Zhang Q, Li X, Zhao J, Lin S, Jin Q, Hong H, Huon A, Charlton T, Li Q, Yan W, Wang J, Ge C, Wang C, Wang B, Fitzsimmons MR, Guo H, Gu L, Yin W, Jin KJ, Guo EJ. Atomically engineered cobaltite layers for robust ferromagnetism. SCIENCE ADVANCES 2022; 8:eabq3981. [PMID: 36306366 PMCID: PMC9616489 DOI: 10.1126/sciadv.abq3981] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Emergent phenomena at heterointerfaces are directly associated with the bonding geometry of adjacent layers. Effective control of accessible parameters, such as the bond length and bonding angles, offers an elegant method to tailor competing energies of the electronic and magnetic ground states. In this study, we construct unit-thick syntactic layers of cobaltites within a strongly tilted octahedral matrix via atomically precise synthesis. The octahedral tilt patterns of adjacent layers propagate into cobaltites, leading to a continuation of octahedral tilting while maintaining substantial misfit tensile strain. These effects induce severe rumpling within an atomic plane of neighboring layers, further triggering the electronic reconstruction between the splitting orbitals. First-principles calculations reveal that the cobalt ions transit to a higher spin state level upon octahedral tilting, resulting in robust ferromagnetism in ultrathin cobaltites. This work demonstrates a design methodology for fine-tuning the lattice and spin degrees of freedom in correlated quantum heterostructures by exploiting epitaxial geometric engineering.
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Affiliation(s)
- Shengru Chen
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Xujing Li
- University of Chinese Academy of Sciences, Beijing 100049, China
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
- Spallation Neutron Source Science Center, Dongguan 523803, China
| | - Jiali Zhao
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Shan Lin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiao Jin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Haitao Hong
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Amanda Huon
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Department of Mathematics, Physics, and Statistics, University of the Sciences, Philadelphia, PA 19104, USA
| | - Timothy Charlton
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Qian Li
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
| | - Wensheng Yan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
| | - Jiaou Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Chen Ge
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Can Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Baotian Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
- Spallation Neutron Source Science Center, Dongguan 523803, China
| | - Michael R. Fitzsimmons
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
| | - Haizhong Guo
- Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
| | - Lin Gu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Wen Yin
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
- Spallation Neutron Source Science Center, Dongguan 523803, China
- Corresponding author. (W.Y.); (K.-j.J.); (E.J.G.)
| | - Kui-juan Jin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
- Corresponding author. (W.Y.); (K.-j.J.); (E.J.G.)
| | - Er Jia Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
- Corresponding author. (W.Y.); (K.-j.J.); (E.J.G.)
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9
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Yin Z, Wang J, Wang J, Li J, Zhou H, Zhang C, Zhang H, Zhang J, Shen F, Hao J, Yu Z, Gao Y, Wang Y, Chen Y, Sun JR, Bai X, Wang JT, Hu F, Zhao TY, Shen B. Compressive-Strain-Facilitated Fast Oxygen Migration with Reversible Topotactic Transformation in La 0.5Sr 0.5CoO x via All-Solid-State Electrolyte Gating. ACS NANO 2022; 16:14632-14643. [PMID: 36107149 DOI: 10.1021/acsnano.2c05243] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Modifying the crystal structure and corresponding functional properties of complex oxides by regulating their oxygen content has promising applications in energy conversion and chemical looping, where controlling oxygen migration plays an important role. Therefore, finding an efficacious and feasible method to facilitate oxygen migration has become a critical requirement for practical applications. Here, we report a compressive-strain-facilitated oxygen migration with reversible topotactic phase transformation (RTPT) in La0.5Sr0.5CoOx films based on all-solid-state electrolyte gating modulation. With the lattice strain changing from tensile to compressive strain, significant reductions in modulation duration (∼72%) and threshold voltage (∼70%) for the RTPT were observed, indicating great promotion of RTPT by compressive strain. Density functional theory calculations verify that such compressive-strain-facilitated efficient RTPT comes from significant reduction of the oxygen migration barrier in compressive-strained films. Further, ac-STEM, EELS, and sXAS investigations reveal that varying strain from tensile to compressive enhances the Co 3d band filling, thereby suppressing the Co-O hybrid bond in oxygen vacancy channels, elucidating the micro-origin of such compressive-strain-facilitated oxygen migration. Our work suggests that controlling electronic orbital occupation of Co ions in oxygen vacancy channels may help facilitate oxygen migration, providing valuable insights and practical guidance for achieving highly efficient oxygen-migration-related chemical looping and energy conversion with complex oxides.
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Affiliation(s)
- Zhuo Yin
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Jianlin Wang
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Jing Wang
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Fujian Innovation Academy, Chinese Academy of Sciences, Fuzhou, Fujian 350108, People's Republic of China
| | - Jia Li
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Houbo Zhou
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Cheng Zhang
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, People's Republic of China
| | - Hui Zhang
- School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
| | - Jine Zhang
- School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, People's Republic of China
| | - Feiran Shen
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
- Spallation Neutron Source Science Center, Dongguan 523803, People's Republic of China
| | - Jiazheng Hao
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
- Spallation Neutron Source Science Center, Dongguan 523803, People's Republic of China
| | - Zibing Yu
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Yihong Gao
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Yangxin Wang
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Spallation Neutron Source Science Center, Dongguan 523803, People's Republic of China
| | - Yunzhong Chen
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Ji-Rong Sun
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Xuedong Bai
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Jian-Tao Wang
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Fengxia Hu
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
| | - Tong-Yun Zhao
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, Jiangxi 341000, People's Republic of China
| | - Baogen Shen
- Beijing National Laboratory for Condensed Matter physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
- Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, People's Republic of China
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, Jiangxi 341000, People's Republic of China
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10
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Rout PC, Schwingenschlögl U. Large Spin Coherence Length and High Photovoltaic Efficiency of the Room Temperature Ferrimagnet Ca 2 FeOsO 6 by Strain Engineering. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2106037. [PMID: 35863902 PMCID: PMC9475547 DOI: 10.1002/advs.202106037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 06/13/2022] [Indexed: 06/15/2023]
Abstract
The influence of epitaxial strain on the electronic, magnetic, and optical properties of the distorted double perovskite Ca2 FeOsO6 is studied. These calculations show that the compound realizes a monoclinic structure with P21 /n space group from -6% to +6% strain. While it retains ferrimagnetic ordering with a net magnetic moment of 2 μB per formula unit at low strain, it undergoes transitions into E-antiferromagnetic and C-antiferromagnetic phases at -5% and +5% strain, respectively. It is shown that spin frustration reduces the critical temperature of the ferrimagnetic ordering from the mean field value of 600-350 K, in excellent agreement with the experimental value of 320 K. It is also shown that the critical temperature can be tuned efficiently through strain and that the spin coherence length surpasses that of Sr2 FeMoO6 under tensile strain. An indirect-to-direct bandgap transition is observed at +5% strain. Localization of the valence and conduction states on different transition metal sublattices enables efficient electron-hole separation upon photoexcitation. The calculated spectroscopic limited maximum efficiency of up to 33% points to excellent potential of Ca2 FeOsO6 in solar cell applications.
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Affiliation(s)
- Paresh C. Rout
- Physical Sciences and Engineering Division (PSE)King Abdullah University of Science and Technology (KAUST)Thuwal23955‐6900Saudi Arabia
| | - Udo Schwingenschlögl
- Physical Sciences and Engineering Division (PSE)King Abdullah University of Science and Technology (KAUST)Thuwal23955‐6900Saudi Arabia
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11
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Lu Q, Liu Z, Yang Q, Cao H, Balakrishnan P, Wang Q, Cheng L, Lu Y, Zuo JM, Zhou H, Quarterman P, Muramoto S, Grutter AJ, Chen H, Zhai X. Engineering Magnetic Anisotropy and Emergent Multidirectional Soft Ferromagnetism in Ultrathin Freestanding LaMnO 3 Films. ACS NANO 2022; 16:7580-7588. [PMID: 35446560 DOI: 10.1021/acsnano.1c11065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The combination of small coercive fields and weak magnetic anisotropy makes soft ferromagnetic films extremely useful for nanoscale devices that need to easily switch spin directions. However, soft ferromagnets are relatively rare, particularly in ultrathin films with thicknesses of a few nanometers or less. We have synthesized large-area, high-quality, ultrathin freestanding LaMnO3 films on Si and found unexpected soft ferromagnetism along both the in-plane and out-of-plane directions when the film thickness was reduced to 4 nm. We argue that the vanishing magnetic anisotropy between the two directions is a consequence of two coexisting magnetic easy axes in different atomic layers of the LaMnO3 film. Spectroscopy measurements reveal a change in Mn valence from 3+ in the film interior to approximately 2+ at the surfaces where considerable hydrogen infiltration occurs due to the water dissolving process. First-principles calculations show that protonation of LaMnO3 decreases the Mn valence and switches the magnetic easy axis from in-plane to out-of-plane as the Mn valence approaches 2+ from its 3+ bulk value. Our work demonstrates that ultrathin freestanding films can exhibit functional properties that are absent in homogeneous materials, concomitant with their convenient compatibility with Si-based devices.
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Affiliation(s)
- Qinwen Lu
- Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Zhiwei Liu
- Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Science, East China Normal University, Shanghai 200241, China
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai 200122, China
| | - Qun Yang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Hui Cao
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Purnima Balakrishnan
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Qing Wang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Long Cheng
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Yalin Lu
- Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Jian-Min Zuo
- Department of Materials Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Hua Zhou
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Patrick Quarterman
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Shin Muramoto
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Alexander J Grutter
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Hanghui Chen
- NYU-ECNU Institute of Physics, NYU Shanghai, Shanghai 200122, China
- Department of Physics, New York University, New York, New York 10012, United States
| | - Xiaofang Zhai
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
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12
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Mazza AR, Skoropata E, Sharma Y, Lapano J, Heitmann TW, Musico BL, Keppens V, Gai Z, Freeland JW, Charlton TR, Brahlek M, Moreo A, Dagotto E, Ward TZ. Designing Magnetism in High Entropy Oxides. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2200391. [PMID: 35150081 PMCID: PMC8981892 DOI: 10.1002/advs.202200391] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Indexed: 06/14/2023]
Abstract
In magnetic systems, spin and exchange disorder can provide access to quantum criticality, frustration, and spin dynamics, but broad tunability of these responses and a deeper understanding of strong limit disorder are lacking. Here, it is demonstrated that high entropy oxides present a previously unexplored route to designing materials in which the presence of strong local compositional disorder may be exploited to generate tunable magnetic behaviors-from macroscopically ordered states to frustration-driven dynamic spin interactions. Single-crystal La(Cr0.2 Mn0.2 Fe0.2 Co0.2 Ni0.2 )O3 films are used as a model system hosting a magnetic sublattice with a high degree of microstate disorder in the form of site-to-site spin and exchange type inhomogeneity. A classical Heisenberg model simplified to represent the highest probability microstates well describes how compositionally disordered systems can paradoxically host magnetic uniformity and demonstrates a path toward continuous control over ordering types and critical temperatures. Model-predicted materials are synthesized and found to possess an incipient quantum critical point when magnetic ordering types are designed to be in direct competition, this leads to highly controllable exchange bias behaviors previously accessible only in intentionally designed bilayer heterojunctions.
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Affiliation(s)
- Alessandro R. Mazza
- Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Elizabeth Skoropata
- Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Yogesh Sharma
- Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
- Center for Integrated NanotechnologiesLos Alamos National LaboratoryLos AlamosNM87545USA
| | - Jason Lapano
- Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Thomas W. Heitmann
- University of Missouri Research ReactorThe University of MissouriColumbiaMO65211USA
| | - Brianna L. Musico
- Department of Materials Science and EngineeringUniversity of TennesseeKnoxvilleTN37996‐4545USA
| | - Veerle Keppens
- Department of Materials Science and EngineeringUniversity of TennesseeKnoxvilleTN37996‐4545USA
| | - Zheng Gai
- Center for Nanophase Materials SciencesOak Ridge National LaboratoryOak RidgeTN37831USA
| | - John W. Freeland
- Advanced Photon SourceArgonne National LaboratoryLemontIL60439USA
| | | | - Matthew Brahlek
- Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Adriana Moreo
- Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
- Department of Physics and AstronomyUniversity of TennesseeKnoxvilleTN37996USA
| | - Elbio Dagotto
- Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
- Department of Physics and AstronomyUniversity of TennesseeKnoxvilleTN37996USA
| | - Thomas Z. Ward
- Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
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13
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Yoon S, Gao X, Ok JM, Liao Z, Han MG, Zhu Y, Ganesh P, Chisholm MF, Choi WS, Lee HN. Strain-Induced Atomic-Scale Building Blocks for Ferromagnetism in Epitaxial LaCoO 3. NANO LETTERS 2021; 21:4006-4012. [PMID: 33929867 DOI: 10.1021/acs.nanolett.1c00756] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The origin of strain-induced ferromagnetism, which is robust regardless of the type and degree of strain in LaCoO3 (LCO) thin films, is enigmatic despite intensive research efforts over the past decade. Here, by combining scanning transmission electron microscopy with ab initio density functional theory plus U calculations, we report that the ferromagnetism does not emerge directly from the strain itself but rather from the creation of compressed structural units within ferroelastically formed twin-wall domains. The compressed structural units are magnetically active with the rocksalt-type high-spin/low-spin order. Our study highlights that the ferroelastic nature of ferromagnetic structural units is important for understanding the intriguing ferromagnetic properties in LCO thin films.
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Affiliation(s)
- Sangmoon Yoon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Xiang Gao
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Jong Mok Ok
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Zhaoliang Liao
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Myung-Geun Han
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Yimei Zhu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Panchapakesan Ganesh
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Matthew F Chisholm
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Woo Seok Choi
- Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Ho Nyung Lee
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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14
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Meng M, Sun Y, Li Y, An Q, Wang Z, Lin Z, Yang F, Zhu X, Gao P, Guo J. Three dimensional band-filling control of complex oxides triggered by interfacial electron transfer. Nat Commun 2021; 12:2447. [PMID: 33907193 PMCID: PMC8079372 DOI: 10.1038/s41467-021-22790-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 03/29/2021] [Indexed: 11/09/2022] Open
Abstract
The d-band-filling of transition metals in complex oxides plays an essential role in determining their structural, electronic and magnetic properties. Traditionally, at the oxide heterointerface, band-filling control has been achieved via electrostatic modification in the structure of field-effect transistors or electron transfer, which is limited to the quasi-two-dimension at the interface. Here we report a three-dimensional (3D) band-filling control by changing the local lattice coordination in a designed oxide heterostructure. At the LaCoO3/LaTiO3 heterointerface, due to the Fermi level mismatch, electrons transfer from LaTiO3 to LaCoO3. This triggers destabilisation of the CoO6 octahedrons, i.e. the formation of lattice configurations with a reduced Co valence. The associated oxygen migration results in the 3D topotactic phase transition of LaCoO3. Tuned by the thickness of LaTiO3, different crystalline phases and band-fillings of Co occur, leading to the emergence of different magnetic ground states.
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Affiliation(s)
- Meng Meng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China
| | - Yuanwei Sun
- International Center for Quantum Materials, and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, China
| | - Yuehui Li
- International Center for Quantum Materials, and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, China
| | - Qichang An
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Zhenzhen Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Zijian Lin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Fang Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China
| | - Xuetao Zhu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China.,Songshan Lake Materials Laboratory, Dongguan, Guangdong, China
| | - Peng Gao
- International Center for Quantum Materials, and Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, China. .,Collaborative Innovation Center of Quantum Matter, Beijing, China.
| | - Jiandong Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China. .,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China. .,Songshan Lake Materials Laboratory, Dongguan, Guangdong, China. .,Beijing Academy of Quantum Information Sciences, Beijing, China.
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15
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Huang C, Liao Z, Li M, Guan C, Jin F, Ye M, Zeng X, Zhang T, Chen Z, Qi Y, Gao P, Chen L. A Highly Strained Phase in PbZr 0.2Ti 0.8O 3 Films with Enhanced Ferroelectric Properties. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2003582. [PMID: 33898177 PMCID: PMC8061395 DOI: 10.1002/advs.202003582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 11/22/2020] [Indexed: 06/12/2023]
Abstract
Although epitaxial strain imparted by lattice mismatch between a film and the underlying substrate has led to distinct structures and emergent functionalities, the discrete lattice parameters of limited substrates, combined with strain relaxations driven by film thickness, result in severe obstructions to subtly regulate electro-elastic coupling properties in perovskite ferroelectric films. Here a practical and universal method to achieve highly strained phases with large tetragonal distortions in Pb-based ferroelectric films through synergetic effects of moderately (≈1.0%) misfit strains and laser fluences during pulsed laser deposition process is demonstrated. The phase possesses unexpectedly large Poisson's ratio and negative thermal expansion, and concomitant enhancements of spontaneous polarization (≈100 µC cm-2) and Curie temperature (≈800 °C), 40% and 75% larger than that of bulk counterparts, respectively. This strategy efficiently circumvents the long-standing issue of limited numbers of discrete substrates and enables continuous regulations of exploitable lattice states in functional oxide films with tightly elastic coupled performances beyond their present levels.
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Affiliation(s)
- Chuanwei Huang
- Shenzhen Key Laboratory of Special Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen518060China
| | - Zhaolong Liao
- Shenzhen Key Laboratory of Special Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen518060China
| | - Mingqiang Li
- Electron Microscopy Laboratory, and International Center for Quantum MaterialsSchool of PhysicsPeking UniversityBeijing100871China
| | - Changxin Guan
- Shenzhen Key Laboratory of Special Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen518060China
- Department of PhysicsSouthern University of Science and TechnologyShenzhenGuangdong518055China
- Department of Materials Science and EngineeringHubei UniversityWuhan430062China
| | - Fei Jin
- Shenzhen Key Laboratory of Special Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen518060China
| | - Mao Ye
- Department of PhysicsSouthern University of Science and TechnologyShenzhenGuangdong518055China
| | - Xierong Zeng
- Shenzhen Key Laboratory of Special Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen518060China
| | - Tianjin Zhang
- Department of Materials Science and EngineeringHubei UniversityWuhan430062China
| | - Zuhuang Chen
- School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen518055China
| | - Yajun Qi
- Department of Materials Science and EngineeringHubei UniversityWuhan430062China
| | - Peng Gao
- Electron Microscopy Laboratory, and International Center for Quantum MaterialsSchool of PhysicsPeking UniversityBeijing100871China
| | - Lang Chen
- Department of PhysicsSouthern University of Science and TechnologyShenzhenGuangdong518055China
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16
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Liu H, Fan J, Qian F, Ji Y, Rahman A, Tang R, Zhang L, Ling L, Zhu Y, Yang H. Two-dimensional magnetic interplay in the tensile-strained LaCoO 3 thin films. Phys Chem Chem Phys 2021; 23:4912-4918. [PMID: 33620049 DOI: 10.1039/d0cp05550f] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High-quality epitaxial LaCoO3 (LCO) thin films have been deposited on SrTiO3 (STO) substrates with pulsed laser deposition (PLD). We find that the LCO films undergo a typical ferromagnetic-paramagnetic (FM-PM) phase transition at ∼80 K. To understand the nature of magnetic phase transition, various methods, including the modified Arrott plot and critical isotherm analysis, were used to determine the critical exponents, which are β = 0.754(1) with a Curie temperature TC = 79.8(8) K and γ = 1.52(2) with TC = 79.9(2) K. The reliability of these critical exponents was confirmed using the Widom scaling relation and the scaling hypothesis. Further analysis revealed that the spin coupling within the LCO films exhibits two-dimensional (2D) long-range magnetic interaction and the magnetic exchange distance decays as J(r) ∼r-(3.46). Our critical behavior analysis may shed new light on the further understanding of the origin of FM and the relatively fixed TC in LCO thin films.
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Affiliation(s)
- Hao Liu
- Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.
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17
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Li S, Zhang Q, Lin S, Sang X, Need RF, Roldan MA, Cui W, Hu Z, Jin Q, Chen S, Zhao J, Wang JO, Wang J, He M, Ge C, Wang C, Lu HB, Wu Z, Guo H, Tong X, Zhu T, Kirby B, Gu L, Jin KJ, Guo EJ. Strong Ferromagnetism Achieved via Breathing Lattices in Atomically Thin Cobaltites. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2001324. [PMID: 33314400 DOI: 10.1002/adma.202001324] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 11/09/2020] [Indexed: 06/12/2023]
Abstract
Low-dimensional quantum materials that remain strongly ferromagnetic down to monolayer thickness are highly desired for spintronic applications. Although oxide materials are important candidates for the next generation of spintronics, ferromagnetism decays severely when the thickness is scaled to the nanometer regime, leading to deterioration of device performance. Here, a methodology is reported for maintaining strong ferromagnetism in insulating LaCoO3 (LCO) layers down to the thickness of a single unit cell. It is found that the magnetic and electronic states of LCO are linked intimately to the structural parameters of adjacent "breathing lattice" SrCuO2 (SCO). As the dimensionality of SCO is reduced, the lattice constant elongates over 10% along the growth direction, leading to a significant distortion of the CoO6 octahedra, and promoting a higher spin state and long-range spin ordering. For atomically thin LCO layers, surprisingly large magnetic moment (0.5 μB /Co) and Curie temperature (75 K), values larger than previously reported for any monolayer oxides are observed. The results demonstrate a strategy for creating ultrathin ferromagnetic oxides by exploiting atomic heterointerface engineering, confinement-driven structural transformation, and spin-lattice entanglement in strongly correlated materials.
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Affiliation(s)
- Sisi Li
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- State Key Laboratory of Information Photonics and Optical Communications and Laboratory of Optoelectronics Materials and Devices, School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, China
| | - Qinghua Zhang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Shan Lin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Xiahan Sang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & Nanostructure research center, Wuhan University of Technology, 122 Luoshi Rd., Wuhan, 430070, China
| | - Ryan F Need
- NIST Center for Neutron Research, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL, 32611, USA
| | - Manuel A Roldan
- Eyring Materials Center, Arizona State University, Tempe, AZ, 85287, USA
| | - Wenjun Cui
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & Nanostructure research center, Wuhan University of Technology, 122 Luoshi Rd., Wuhan, 430070, China
| | - Zhiyi Hu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & Nanostructure research center, Wuhan University of Technology, 122 Luoshi Rd., Wuhan, 430070, China
| | - Qiao Jin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Shuang Chen
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450052, China
| | - Jiali Zhao
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Jia-Ou Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Jiesu Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Meng He
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Chen Ge
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Can Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China
| | - Hui-Bin Lu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Zhenping Wu
- State Key Laboratory of Information Photonics and Optical Communications and Laboratory of Optoelectronics Materials and Devices, School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, China
| | - Haizhong Guo
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450052, China
| | - Xin Tong
- China Spallation Neutron Source, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 10049, China
| | - Tao Zhu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China
- China Spallation Neutron Source, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 10049, China
| | - Brian Kirby
- NIST Center for Neutron Research, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Lin Gu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China
| | - Kui-Juan Jin
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China
| | - Er-Jia Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
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18
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Nair AK, Rani S, Kamalakar MV, Ray SJ. Bi-stimuli assisted engineering and control of magnetic phase in monolayer CrOCl. Phys Chem Chem Phys 2020; 22:12806-12813. [PMID: 32469019 DOI: 10.1039/d0cp01204a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Magnetic phase control and room temperature magnetic stability in two-dimensional (2D) materials are indispensable for realising advanced spintronic and magneto-electronic functions. Our current work employs first-principles calculations to comprehensively study the magnetic behaviour of 2D CrOCl, uncovering the impact of strain and electric field on the material. Our studies have revealed that uniaxial strain leads to the feasibility of room temperature ferromagnetism in the layer and also detected the occurrence of a ferromagnetic → antiferromagnetic phase transition in the system, which is anisotropic along the armchair and zigzag directions. Beyond such a strain effect, the coupling of strain and electric field leads to a remarkable enhancement of the Curie temperature (Tc) ∼ 450 K in CrOCl. These predictions based on our detailed simulations show the prospect of multi-stimuli magnetic phase control, which could have great significance for realizing magneto-mechanical sensors.
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Affiliation(s)
- A K Nair
- Department of Physics, Indian Institute of Technology Patna, Bihta 801106, India.
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19
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Li X, Zhang Z, Zhang H. High throughput study on magnetic ground states with Hubbard U corrections in transition metal dihalide monolayers. NANOSCALE ADVANCES 2020; 2:495-501. [PMID: 36134001 PMCID: PMC9419158 DOI: 10.1039/c9na00588a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 12/03/2019] [Indexed: 06/12/2023]
Abstract
We present a high throughput study of the magnetic ground states for 90 transition metal dihalide monolayers TMX2 using density functional theory based on a collection of Hubbard U values. Stable geometrical phases between 2H and 1T are first determined. Spin-polarized calculations show that 50 out of 55 magnetic TMX2 monolayers are energetically prone to the 1T phase. Further, the magnetic ground states are determined by considering four local spin models with respect to different U values. Interestingly, 23 out of 55 TMX2 monolayers exhibit robust magnetic ground orderings which will not be changed by the U values. Among them, NiCl2 with a magnetic moment of 2 μ B is a ferromagnetic (FM) insulator, while the VX2, MnX2 (X = Cl, Br and I), PtCl2 and CoI2 monolayers have noncollinear antiferromagnetic (120°-AFM) ground states with a tiny in-plane magnetic anisotropic energy, indicating flexible magnetic orientation rotation. The exchange parameters for both robust FM and 120°-AFM systems are analyzed in detail with the Heisenberg model. Our high-throughput calculations give a systematic study of the electronic and magnetic properties of TMX2 monolayers, and these two-dimensional materials with versatile magnetic behavior may have great potential for spintronic applications.
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Affiliation(s)
- Xinru Li
- College of Physics and Optoelectronic Engineering, Shenzhen University 518060 Shenzhen P. R. China
- Institute of Materials Science, Darmstadt University of Technology 64287 Darmstadt Germany
| | - Zeying Zhang
- College of Mathematics and Physics, Beijing University of Chemical Technology 100029 Beijing P. R. China
- Institute of Materials Science, Darmstadt University of Technology 64287 Darmstadt Germany
| | - Hongbin Zhang
- Institute of Materials Science, Darmstadt University of Technology 64287 Darmstadt Germany
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20
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Li W, Zhu B, He Q, Borisevich AY, Yun C, Wu R, Lu P, Qi Z, Wang Q, Chen A, Wang H, Cavill SA, Zhang KHL, MacManus‐Driscoll JL. Interface Engineered Room-Temperature Ferromagnetic Insulating State in Ultrathin Manganite Films. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:1901606. [PMID: 31921553 PMCID: PMC6947487 DOI: 10.1002/advs.201901606] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 10/23/2019] [Indexed: 06/10/2023]
Abstract
Ultrathin epitaxial films of ferromagnetic insulators (FMIs) with Curie temperatures near room temperature are critically needed for use in dissipationless quantum computation and spintronic devices. However, such materials are extremely rare. Here, a room-temperature FMI is achieved in ultrathin La0.9Ba0.1MnO3 films grown on SrTiO3 substrates via an interface proximity effect. Detailed scanning transmission electron microscopy images clearly demonstrate that MnO6 octahedral rotations in La0.9Ba0.1MnO3 close to the interface are strongly suppressed. As determined from in situ X-ray photoemission spectroscopy, O K-edge X-ray absorption spectroscopy, and density functional theory, the realization of the FMI state arises from a reduction of Mn eg bandwidth caused by the quenched MnO6 octahedral rotations. The emerging FMI state in La0.9Ba0.1MnO3 together with necessary coherent interface achieved with the perovskite substrate gives very high potential for future high performance electronic devices.
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Affiliation(s)
- Weiwei Li
- Department of Materials Science and MetallurgyUniversity of Cambridge27 Charles Babbage RoadCambridgeCB3 0FSUK
| | - Bonan Zhu
- Department of Materials Science and MetallurgyUniversity of Cambridge27 Charles Babbage RoadCambridgeCB3 0FSUK
| | - Qian He
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityMain Building, Park PlaceCardiffCF10 3ATUK
| | - Albina Y. Borisevich
- Center for Nanophase Materials SciencesOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Chao Yun
- Department of Materials Science and MetallurgyUniversity of Cambridge27 Charles Babbage RoadCambridgeCB3 0FSUK
| | - Rui Wu
- Department of Materials Science and MetallurgyUniversity of Cambridge27 Charles Babbage RoadCambridgeCB3 0FSUK
| | - Ping Lu
- Sandia National LaboratoryAlbuquerqueNM87185USA
| | - Zhimin Qi
- School of Materials EngineeringPurdue UniversityWest LafayetteIN47907USA
| | - Qiang Wang
- Department of Physics and AstronomyWest Virginia UniversityMorgantownWV26506USA
| | - Aiping Chen
- Center for Integrated NanotechnologiesLos Alamos National LaboratoryLos AlamosNM87545USA
| | - Haiyan Wang
- School of Materials EngineeringPurdue UniversityWest LafayetteIN47907USA
| | - Stuart A. Cavill
- Department of PhysicsUniversity of YorkYorkYO10 5DDUK
- Diamond Light SourceDidcotOX11 0DEUK
| | - Kelvin H. L. Zhang
- State Key Laboratory of Physical Chemistry of Solid SurfacesCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China
| | - Judith L. MacManus‐Driscoll
- Department of Materials Science and MetallurgyUniversity of Cambridge27 Charles Babbage RoadCambridgeCB3 0FSUK
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21
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Zeng Z, Xu Y, Zhang Z, Gao Z, Luo M, Yin Z, Zhang C, Xu J, Huang B, Luo F, Du Y, Yan C. Rare-earth-containing perovskite nanomaterials: design, synthesis, properties and applications. Chem Soc Rev 2020; 49:1109-1143. [PMID: 31939973 DOI: 10.1039/c9cs00330d] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
As star material, perovskites have been widely used in the fields of optics, photovoltaics, electronics, magnetics, catalysis, sensing, etc. However, some inherent shortcomings, such as low efficiency (power conversion efficiency, external quantum efficiency, etc.) and poor stability (against water, oxygen, ultraviolet light, etc.), limit their practical applications. Downsizing the materials into nanostructures and incorporating rare earth (RE) ions are effective means to improve their properties and broaden their applications. This review will systematically summarize the key points in the design, synthesis, property improvements and application expansion of RE-containing (including both RE-based and RE-doped) halide and oxide perovskite nanomaterials (PNMs). The critical factors of incorporating RE elements into different perovskite structures and the rational design of functional materials will be discussed in detail. The advantages and disadvantages of different synthesis methods for PNMs will be reviewed. This paper will also summarize some practical experiences in selecting suitable RE elements and designing multi-functional materials according to the mechanisms and principles of REs promoting the properties of perovskites. At the end of this review, we will provide an outlook on the opportunities and challenges of RE-containing PNMs in various fields.
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Affiliation(s)
- Zhichao Zeng
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
| | - Yueshan Xu
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
| | - Zheshan Zhang
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
| | - Zhansheng Gao
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
| | - Meng Luo
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
| | - Zongyou Yin
- Research School of Chemistry, The Australian National University, Canberra, ACT 2601, Australia
| | - Chao Zhang
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
| | - Jun Xu
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
| | - Bolong Huang
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China.
| | - Feng Luo
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
| | - Yaping Du
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China.
| | - Chunhua Yan
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China. and Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, China and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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22
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Cheng H, Mao AJ, Cheng XR, Tian H, Dou XL, Yang SM, Kuang XY. Hydrostatic pressure induced structural phase transition and mechanical properties of fluoroperovskite. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:505406. [PMID: 31491779 DOI: 10.1088/1361-648x/ab420d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We perform the first-principles calculations combined with the particle swarm optimization algorithm to investigate the high-pressure phase diagrams of Na[Formula: see text]F3 ([Formula: see text] = Mn, Ni, Zn). Two reconstructive phase transitions are predicted from Pv-[Formula: see text] to pPv-[Formula: see text] at about 9 GPa and pPv-[Formula: see text] to ppPv-[Formula: see text] at around 26 GPa for NaZnF3. That is not the case for NaMnF3-a direct transition (reconstructive transition in nature but with the same Pnma space group) from Pv-[Formula: see text] to ppPv-[Formula: see text] phase around 12 GPa. Strikingly, our simulated results manifest that a disproportionation phase of NaZnF3 post-perovskite is uncovered along the way, which provides a successful explanation for the observed results in experiment. Additionally, the mechanical and thermal properties, especially the dynamical property, of the four NaZnF3 phases have also been studied. Here, we reveal the obvious softening of [Formula: see text]-wave velocity and bulk sound speed in pPv-[Formula: see text]-to-ppPv-[Formula: see text] transition, which may result in the discontinuity of seismic waves propagation through the Earth's interior.
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Affiliation(s)
- Hao Cheng
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People's Republic of China
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23
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Mushtaq M, Dar SA, Sattar MA, Kouser R. First-principles study of structural, electronic, magnetic, thermodynamic and mechanical properties of ferromagnetic Mn 2MoAl Heuslar alloy. J Mol Graph Model 2019; 95:107507. [PMID: 31837479 DOI: 10.1016/j.jmgm.2019.107507] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Revised: 11/16/2019] [Accepted: 12/02/2019] [Indexed: 11/18/2022]
Abstract
The Mn-based Mn2MoAl type ternary Heusler alloy is of particular interest due to its potential ferromagnetic properties and high spin-polarization. The present paper aims to explore the physical properties of this new alloy for its possible technological applications and also provide theoretical basis to the future experiments. The electronic structure, magnetism, and elastic properties of the alloy are studied by using first-principles calculations based on density functional theory (DFT), along with calculation of thermodynamic properties within quasi-harmonic approximation. The structural analysis predicts the optimized lattice constant of 5.90 Å and the ferromagnetic stable state. The electronic band structure calculations at GGA-level reveal that present alloy is nearly half-metal with spin-polarization up to 94% at the Fermi level, whereas, GGA + U calculations reveal Mn2MoAl alloy to be a quite spin polarized metal. The calculated total magnetic moment Mt of the unit-cell is found to be 1.04 μB, which nearly obeys Mt = │Zt-24│formula. The individual Mn, Mo and Al atoms carry magnetic moment of 0.70 μB, -0.28 μB, -0.01μB, respectively. Employing quasi-harmonic approximation, interesting thermodynamic properties of the alloy have been investigated. Furthermore, the elastic and mechanical properties have been investigated. The results confirm that Mn2MoAl alloy is mechanically stable, ductile, anisotropic, with metallic inter-atomic bonding and is expected to be beneficial for the spintronic technology.
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Affiliation(s)
- Muhammad Mushtaq
- Department of Physics, Women University of A.J.& K. Bagh, 12500, Pakistan.
| | - Sajad Ahmad Dar
- Department of Physics, Govt. Motilal Vigyan Mahavidyalya College, Bhopal, MP, 462008, India.
| | - Muhammad Atiff Sattar
- Department of Physics, College of Science, United Arab Emirates University, Al-Ain, United Arab Emirates
| | - Rabia Kouser
- Department of Chemistry, Faculty of Natural Science Jamia Millia Islamia, New Delhi, 110025, India
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24
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Zhang X, Li B, Cheng J, Chen X, Wang L, Miu Z, Song Z, Chi F, Liu S, Wang ZH. Weak ferromagnetic insulator with huge coercivity in monoclinic double perovskite La 2CuIrO 6. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:435601. [PMID: 31284271 DOI: 10.1088/1361-648x/ab2ff8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Insulating ferromagnets with high T C are required for many new magnetic devices. More complexity arises when strongly correlated 3d ions coexist with strongly spin-orbit coupled 5d ones in a double perovskite. Here, we perform the structural, magnetic, and density functional theory (DFT) study of such double perovskite La2CuIrO6. A new P21/n polymorph is found according to the comprehensive analysis of x-ray, Raman scattering and phonon spectrum. The magnetization reveals a weak ferromagnetic (FM) transition at T C = 62 K and short range FM order in higher temperature range. A huge coercivity is found as high as H C ~ 11.96 kOe at 10 K, which, in combination with the negative trapped field, results in the magnetization reversal in the zero field cooling measurement. The first principle calculations confirm the observed FM state and suggest La2CuIrO6 of this polymorph is a Mott insulating ferromagnet assisted by the spin-orbit coupling.
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Affiliation(s)
- Xingyu Zhang
- College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications (NJUPT), Nanjing, Jiangsu 210023, People's Republic of China
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25
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Zhu L, Chen S, Zhang H, Zhang J, Sun Y, Li X, Xu Z, Wang L, Sun J, Gao P, Wang W, Bai X. Strain-Inhibited Electromigration of Oxygen Vacancies in LaCoO 3. ACS APPLIED MATERIALS & INTERFACES 2019; 11:36800-36806. [PMID: 31539219 DOI: 10.1021/acsami.9b08406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The oxygen vacancy profile in LaCoO3 exhibits rich phases with distinct structures, symmetries, and magnetic properties. Exploration of the lattice degree of freedom of LaCoO3 in the transition between these different structural phases may provide a route to enable new functionality in oxide materials with potential applications. To date, the oxygen vacancy profile transition in LaCoO3 has mainly been induced by transition-metal doping or thermal treatment. Epitaxial strain was proposed to compete with the lattice degree of freedom but has not yet been rationalized. Here, the experimental findings of strain-inhibited structural transition from perovskite to brownmillerite during the electromigration of oxygen vacancies in epitaxial LaCoO3 thin films are demonstrated. The results indicate that the oxygen vacancy ordering phase induced by the electric field is suppressed locally by both epitaxial strain field and external loads shown by in situ aberration-corrected (scanning)/ transmission electron microscopy. The demonstrated complex interplay between the electric and strain fields in the structural transitions of LaCoO3 opens up prospects for manipulating new physical properties by external excitations and/or strain engineering of a substrate.
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Affiliation(s)
- Liang Zhu
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100190 , China
| | - Shulin Chen
- Electron Microscopy Laboratory, and International Center for Quantum Materials, School of Physics , Peking University , Beijing 100871 , China
- State Key Laboratory of Advanced Welding and Joining , Harbin Institute of Technology , Harbin 150001 , China
| | - Hui Zhang
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100190 , China
| | - Jine Zhang
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100190 , China
| | - Yuanwei Sun
- Electron Microscopy Laboratory, and International Center for Quantum Materials, School of Physics , Peking University , Beijing 100871 , China
| | - Xiaomin Li
- Electron Microscopy Laboratory, and International Center for Quantum Materials, School of Physics , Peking University , Beijing 100871 , China
| | - Zhi Xu
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- Songshan Lake Materials Laboratory , Dongguan , Guangdong 523808 , China
| | - Lifen Wang
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
| | - Jirong Sun
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100190 , China
- Songshan Lake Materials Laboratory , Dongguan , Guangdong 523808 , China
| | - Peng Gao
- Electron Microscopy Laboratory, and International Center for Quantum Materials, School of Physics , Peking University , Beijing 100871 , China
- Collaborative Innovation Center of Quantum Matter , Beijing 100871 , China
| | - Wenlong Wang
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- Songshan Lake Materials Laboratory , Dongguan , Guangdong 523808 , China
| | - Xuedong Bai
- Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , Beijing 100190 , China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100190 , China
- Songshan Lake Materials Laboratory , Dongguan , Guangdong 523808 , China
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26
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Rout PC, Srinivasan V. Emergence of a Multiferroic Half-Metallic Phase in Bi_{2}FeCrO_{6} through Interplay of Hole Doping and Epitaxial Strain. PHYSICAL REVIEW LETTERS 2019; 123:107201. [PMID: 31573301 DOI: 10.1103/physrevlett.123.107201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 07/17/2019] [Indexed: 06/10/2023]
Abstract
Epitaxial strain has been shown to drive structural phase transitions along with novel functionalities in perovskite-based thin films. Aliovalent doping at the A site can drive an insulator-to-metal and magnetic transitions in perovskites along with a variety of interesting structural and electronic phenomena. Using first-principles calculations, we predict the formation of a multiferroic half-metallic phase with a large magnetic moment in the double perovskite, Bi_{2}FeCrO_{6}, by coupling epitaxial strain with A-site hole doping. We also demonstrate that epitaxial strain can be used to manipulate the hole states created by doping to induce half-metal to insulator, antipolar to polar, antiferromagnetic to ferromagnetic, orbital ordering and charge ordering transitions. Our work also suggests that hole doping under strain could lead to mitigation of issues related to antisite defects and lowered magnetization in thin films of the material.
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Affiliation(s)
- Paresh C Rout
- Department of Physics, Indian Institute of Science Education and Research Bhopal, Bhopal 462 066, India
| | - Varadharajan Srinivasan
- Department of Physics, Indian Institute of Science Education and Research Bhopal, Bhopal 462 066, India
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal 462 066, India
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27
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Li J, Wang Y, Zhang G, Yin H, Chen D, Sun W, Shi B, Cheng Z. Seeking large Seebeck effects in LaX(X = Mn and Co)O 3/SrTiO 3 superlattices by exploiting high spin-polarized effects. Phys Chem Chem Phys 2019; 21:14973-14983. [PMID: 31237601 DOI: 10.1039/c9cp02486g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
SrTiO3-based transition-metal oxide heterostructures with superconducting, ferromagnetic, ferroelectric, and ferroelastic properties exhibit high application potential in the fields of energy storage, energy conversion, and spintronic devices. Meanwhile, high effective (charge)-Seebeck coefficient materials composed of a ferromagnetic layer and SrTiO3 insulator layer have been achieved but we still have blocks to pursuing high spin-Seebeck coefficient materials. Here, we use first-principles calculations combined with spin-resolved Boltzmann transport theory to investigate the spin- and effective-Seebeck coefficients in the LaX(X = Mn and Co)O3/SrTiO3 superlattice. Compared with the LaMnO3/SrTiO3 superlattice, LaCoO3/SrTiO3 with ferromagnetic ordering has high spin polarization, relatively low valence valley degeneracy but high effective mass. Utilizing these characteristics, the maximum spin-Seebeck coefficient of LaMnO3/SrTiO3 is -152 μV K-1 at 450 K along the cross-plane direction, while LaCoO3/SrTiO3 reaches -247 μV K-1 under the same conditions. Interestingly, the spin- and effective-Seebeck coefficients are amazingly consistent with each other below 200 K, which indicates that one spin channel (spin-up or spin-down) dominates the carrier transport, and the other one (spin-down or spin-up) is filtered out. These characteristics are mainly associated with the magnetic MnO2/CoO2 layers with distinct dxy and dz2 orbitals near the Fermi level. Our results clarify the relationship of spin- and effective-Seebeck coefficients and indicate that SrTiO3-based transition metal oxide heterointerfaces are a key candidate for spin caloritronics.
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Affiliation(s)
- Jingyu Li
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Yuanxu Wang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Guangbiao Zhang
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Huabing Yin
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Dong Chen
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Wei Sun
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Beibei Shi
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
| | - Zhenxiang Cheng
- Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China. and Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, North Wollongong, Australia.
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28
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Li M, Tang C, Paudel TR, Song D, Lü W, Han K, Huang Z, Zeng S, Renshaw Wang X, Yang P, Chen J, Venkatesan T, Tsymbal EY, Li C, Pennycook SJ. Controlling the Magnetic Properties of LaMnO 3 /SrTiO 3 Heterostructures by Stoichiometry and Electronic Reconstruction: Atomic-Scale Evidence. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1901386. [PMID: 31099075 DOI: 10.1002/adma.201901386] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 04/10/2019] [Indexed: 06/09/2023]
Abstract
Interface-driven magnetic effects and phenomena associated with spin-orbit coupling and intrinsic symmetry breaking are of importance for fundamental physics and device applications. How interfaces affect the interplay between charge, spin, orbital, and lattice degrees of freedom is the key to boosting device performance. In LaMnO3 /SrTiO3 (LMO/STO) polar-nonpolar heterostructures, electronic reconstruction leads to an antiferromagnetic to ferromagnetic transition, making them viable for spin filter applications. The interfacial electronic structure plays a critical role in the understanding of the microscopic origins of the observed magnetic phase transition, from antiferromagnetic at 5 unit cells (ucs) of LMO or below to ferromagnetic at 6 ucs or above, yet such a study is missing. Here, an atomic scale understanding of LMO/STO ambipolar ferromagnetism is offered by quantifying the interface charge distribution and performing first-principles density functional theory (DFT) calculations across this abrupt magnetic transition. It is found that the electronic reconstruction is confined within the first 3 ucs of LMO from the interface, and more importantly, it is robust against oxygen nonstoichiometry. When restoring stoichiometry, an enhanced ferromagnetic insulating state in LMO films with a thickness as thin as 2 nm (5 uc) is achieved, making LMO readily applicable as barriers in spin filters.
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Affiliation(s)
- Mengsha Li
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Chunhua Tang
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Tula R Paudel
- Department of Physics and Astronomy and Nebraska, Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, 68588, USA
| | - Dongsheng Song
- NUSNNI-Nanocore, National University of Singapore, Singapore, 117411, Singapore
| | - Weiming Lü
- Spintronics Institute, University of Jinan, Jinan, 250022, China
- Condensed Matter Science and Technology Institute and Department of Physics, Harbin Institute of Technology, Harbin, 150001, China
| | - Kun Han
- NUSNNI-Nanocore, National University of Singapore, Singapore, 117411, Singapore
| | - Zhen Huang
- NUSNNI-Nanocore, National University of Singapore, Singapore, 117411, Singapore
| | - Shengwei Zeng
- NUSNNI-Nanocore, National University of Singapore, Singapore, 117411, Singapore
| | - Xiao Renshaw Wang
- School of Physical and Mathematical Sciences and School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Ping Yang
- Singapore Synchrotron Light Source National University of Singapore 5 Research Link, Singapore, 117603, Singapore
| | - Jingsheng Chen
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | | | - Evgeny Y Tsymbal
- Department of Physics and Astronomy and Nebraska, Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, 68588, USA
| | - Changjian Li
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
| | - Stephen John Pennycook
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117575, Singapore
- NUSNNI-Nanocore, National University of Singapore, Singapore, 117411, Singapore
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29
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Sohn C, Skoropata E, Choi Y, Gao X, Rastogi A, Huon A, McGuire MA, Nuckols L, Zhang Y, Freeland JW, Haskel D, Lee HN. Room-Temperature Ferromagnetic Insulating State in Cation-Ordered Double-Perovskite Sr 2 Fe 1+ x Re 1- x O 6 Films. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1805389. [PMID: 30489665 DOI: 10.1002/adma.201805389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 10/23/2018] [Indexed: 06/09/2023]
Abstract
Ferromagnetic insulators (FMIs) are one of the most important components in developing dissipationless electronic and spintronic devices. However, FMIs are innately rare to find in nature as ferromagnetism generally accompanies metallicity. Here, novel room-temperature FMI films that are epitaxially synthesized by deliberate control of the ratio between two B-site cations in the double perovskite Sr2 Fe1+ x Re1- x O6 (-0.2 ≤ x ≤ 0.2) are reported. In contrast to the known FM metallic phase in stoichiometric Sr2 FeReO6 , an FMI state with a high Curie temperature (Tc ≈ 400 K) and a large saturation magnetization (MS ≈ 1.8 µB f.u.-1 ) is found in highly cation-ordered Fe-rich phases. The stabilization of the FMI state is attributed to the formation of extra Fe3+ Fe3+ and Fe3+ Re6+ bonding states, which originate from the relatively excess Fe ions owing to the deficiency in Re ions. The emerging FMI state created by controlling cations in the oxide double perovskites opens the door to developing novel oxide quantum materials and spintronic devices.
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Affiliation(s)
- Changhee Sohn
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Elizabeth Skoropata
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Yongseong Choi
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Xiang Gao
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Ankur Rastogi
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Amanda Huon
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
- Department of Materials Science & Engineering, Drexel University, Philadelphia, PA, 19104, USA
| | - Michael A McGuire
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Lauren Nuckols
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - Yanwen Zhang
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - John W Freeland
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Daniel Haskel
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Ho Nyung Lee
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
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30
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Zhang N, Zhu Y, Li D, Pan D, Tang Y, Han M, Ma J, Wu B, Zhang Z, Ma X. Oxygen Vacancy Ordering Modulation of Magnetic Anisotropy in Strained LaCoO 3- x Thin Films. ACS APPLIED MATERIALS & INTERFACES 2018; 10:38230-38238. [PMID: 30339014 DOI: 10.1021/acsami.8b13674] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Oxygen vacancy configurations and concentration are coupled with the magnetic, electronic, and transport properties of perovskite oxides, and manipulating the physical properties by tuning the vacancy structures of thin films is crucial for applications in many functional devices. In this study, we report a direct atomic resolution observation of the preferred orientation of vacancy ordering structure in the epitaxial LaCoO3- x (LCO) thin films under various strains from large compressive to large tensile strain utilizing scanning transmission electron microscopy (STEM). Under compressive strains, the oxygen vacancy ordering prefers to be along the planes parallel to the heterointerface. Changing the strains from compressive to tensile, the oxygen vacancy planes turn to be perpendicular to the heterointerface. Aberration-corrected STEM images, electron diffractions, and X-ray diffraction combined with X-ray photoelectron spectroscopy demonstrate that the vacancy concentration increases with increasing misfit strains and vacancy distribution is more ordered and homogeneous. The temperature-dependent magnetization curves show the Curie temperature increases, displaying a positive correlation with the misfit strains. With change in the strain from compressive to tensile, anisotropy fields vary and show large values under tensile strains. It is proposed that oxygen vacancy concentration and preferred ordering planes are responsible for the enhanced magnetic properties of LCO films. Our results have realized a controllable preparation of oxygen vacancy ordering structures via strains and thus provide an effective method to regulate and optimize the physical properties such as magnetic properties by strain engineering.
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Affiliation(s)
- Ningbin Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research , Chinese Academy of Sciences , Wenhua Road 72 , 110016 Shenyang , China
- School of Material Science and Engineering , University of Science and Technology of China , 230026 Hefei , China
| | - Yinlian Zhu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research , Chinese Academy of Sciences , Wenhua Road 72 , 110016 Shenyang , China
| | - Da Li
- Shenyang National Laboratory for Materials Science, Institute of Metal Research , Chinese Academy of Sciences , Wenhua Road 72 , 110016 Shenyang , China
| | - Desheng Pan
- Shenyang National Laboratory for Materials Science, Institute of Metal Research , Chinese Academy of Sciences , Wenhua Road 72 , 110016 Shenyang , China
- School of Material Science and Engineering , University of Science and Technology of China , 230026 Hefei , China
| | - Yunlong Tang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research , Chinese Academy of Sciences , Wenhua Road 72 , 110016 Shenyang , China
| | - Mengjiao Han
- Shenyang National Laboratory for Materials Science, Institute of Metal Research , Chinese Academy of Sciences , Wenhua Road 72 , 110016 Shenyang , China
| | - Jinyuan Ma
- Shenyang National Laboratory for Materials Science, Institute of Metal Research , Chinese Academy of Sciences , Wenhua Road 72 , 110016 Shenyang , China
- State Key Lab of Advanced Processing and Recycling on Non-ferrous Metals , Lanzhou University of Technology , Langongping Road 287 , 730050 Lanzhou , China
| | - Bo Wu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research , Chinese Academy of Sciences , Wenhua Road 72 , 110016 Shenyang , China
- School of Material Science and Engineering , University of Science and Technology of China , 230026 Hefei , China
| | - Zhidong Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research , Chinese Academy of Sciences , Wenhua Road 72 , 110016 Shenyang , China
| | - Xiuliang Ma
- Shenyang National Laboratory for Materials Science, Institute of Metal Research , Chinese Academy of Sciences , Wenhua Road 72 , 110016 Shenyang , China
- State Key Lab of Advanced Processing and Recycling on Non-ferrous Metals , Lanzhou University of Technology , Langongping Road 287 , 730050 Lanzhou , China
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31
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Zhu S, Meng D, Liang G, Shi G, Zhao P, Cheng P, Li Y, Zhai X, Lu Y, Chen L, Wu K. Proximity-induced magnetism and an anomalous Hall effect in Bi 2Se 3/LaCoO 3: a topological insulator/ferromagnetic insulator thin film heterostructure. NANOSCALE 2018; 10:10041-10049. [PMID: 29774918 DOI: 10.1039/c8nr02083c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Inducing magnetism in a topological insulator (TI) by exchange coupling with a ferromagnetic insulator (FMI) will break the time-reversal symmetry of topological surface states, offering possibilities to realize several predicted novel magneto-electric effects. Seeking suitable FMI materials is crucial for the coupling of heterojunctions, and yet is challenging as well and only a few kinds have been explored. In this report, we introduce epitaxial LaCoO3 thin films on a SrTiO3 substrate, which is an insulating ferromagnet with a Curie temperature of TC ∼ 85 K, to be combined with TIs for proximity coupling. Thin films of the prototype topological insulator, Bi2Se3, are successfully grown onto the (001) surface of LaCoO3/SrTiO3, forming a high-quality TI/FMI heterostructure with a sharp interface. The magnetic and transport measurements manifest the emergence of a ferromagnetic phase in Bi2Se3 films, with additional induced moments and a suppressed weak antilocalization effect, while preserving the carrier mobility of the intrinsic Bi2Se3 films at the same time. Moreover, a signal of an anomalous Hall effect is observed and persists up to temperatures above 100 K, paving the way towards spintronic device applications.
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Affiliation(s)
- Shanna Zhu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
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32
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Sukumar M, Kennedy LJ, Vijaya JJ, Al-Najar B, Bououdina M. Co2+ substituted La2CuO4/LaCoO3 perovskite nanocomposites: synthesis, properties and heterogeneous catalytic performance. NEW J CHEM 2018. [DOI: 10.1039/c8nj04133d] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Cobalt substituted La2CuO4/LaCoO3 perovskite nanocomposites were prepared using a microwave combustion method.
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Affiliation(s)
- M. Sukumar
- Materials and Physics Division
- School of Advanced Sciences
- Vellore Institute of Technology (VIT)
- Chennai Campus
- Chennai 600 127
| | - L. John Kennedy
- Materials and Physics Division
- School of Advanced Sciences
- Vellore Institute of Technology (VIT)
- Chennai Campus
- Chennai 600 127
| | - J. Judith Vijaya
- Catalysis and Nanomaterials Research Laboratory
- Department of Chemistry
- Loyola College (Autonomous)
- Chennai 600 034
- India
| | - B. Al-Najar
- Department of Physics
- College of Science
- University of Bahrain
- Bahrain
| | - M. Bououdina
- Department of Physics
- College of Science
- University of Bahrain
- Bahrain
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