globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1819570116
论文题名:
Atomic-scale determination of spontaneous magnetic reversal in oxide heterostructures
作者: Saghayezhian M.; Kouser S.; Wang Z.; Guo H.; Jin R.; Zhang J.; Zhu Y.; Pantelides S.T.; Plummer E.W.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期:21
起始页码: 10309
结束页码: 10316
语种: 英语
英文关键词: Density functional theory ; Electron microscopy ; Magnetism ; Oxide interfaces ; Thin films
Scopus关键词: ferromagnetic material ; lanthanum ; manganese oxide ; oxide ; strontium ; titanium dioxide ; Article ; chemical interaction ; chemical structure ; density functional theory ; electron energy loss spectroscopy ; magnetism ; oxidation ; physics ; priority journal ; room temperature ; scanning transmission electron microscopy ; static electricity ; stoichiometry
英文摘要: Interfaces between transition metal oxides are known to exhibit emerging electronic and magnetic properties. Here we report intriguing magnetic phenomena for La2/3Sr1/3MnO3 films on an SrTiO3 (001) substrate (LSMO/STO), where the interface governs the macroscopic properties of the entire monolithic thin film. The interface is characterized on the atomic level utilizing scanning transmission electron microscopy and electron energy loss spectroscopy (STEMEELS), and density functional theory (DFT) is employed to elucidate the physics. STEM-EELS reveals mixed interfacial stoichiometry, subtle lattice distortions, and oxidation-state changes. Magnetic measurements combined with DFT calculations demonstrate that a unique form of antiferromagnetic exchange coupling appears at the interface, generating a novel exchange spring-type interaction that results in a remarkable spontaneous magnetic reversal of the entire ferromagnetic film, and an inverted magnetic hysteresis, persisting above room temperature. Formal oxidation states derived from electron spectroscopy data expose the fact that interfacial oxidation states are not consistent with nominal charge counting. The present work demonstrates the necessity of atomically resolved electron microscopy and spectroscopy for interface studies. Theory demonstrates that interfacial nonstoichiometry is an essential ingredient, responsible for the observed physical properties. The DFT-calculated electrostatic potential is flat in both the LSMO and STO sides (no internal electric field) for both Sr-rich and stoichiometric interfaces, while the DFT-calculated charge density reveals no charge transfer/ accumulation at the interface, indicating that oxidation-state changes do not necessarily reflect charge transfer and that the concept of polar mismatch is not applicable in metal-insulator polar-nonpolar interfaces. © 2019 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163583
Appears in Collections:气候变化与战略

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作者单位: Saghayezhian, M., Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, United States; Kouser, S., Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, United States, Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN 37235, United States, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States; Wang, Z., Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, United States, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, United States; Guo, H., Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, United States; Jin, R., Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, United States; Zhang, J., Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, United States; Zhu, Y., Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, United States; Pantelides, S.T., Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, United States, Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN 37235, United States, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States; Plummer, E.W., Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, United States

Recommended Citation:
Saghayezhian M.,Kouser S.,Wang Z.,et al. Atomic-scale determination of spontaneous magnetic reversal in oxide heterostructures[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(21)
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