globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1812822116
论文题名:
Anisotropic spin-orbit torque generation in epitaxial SrIrO3 by symmetry design
作者: Nan T.; Anderson T.J.; Gibbons J.; Hwang K.; Campbell N.; Zhou H.; Dong Y.Q.; Kim G.Y.; Shao D.F.; Paudel T.R.; Reynolds N.; Wang X.J.; Sun N.X.; Tsymbal E.Y.; Choi S.Y.; Rzchowski M.S.; Kim Y.B.; Ralph D.C.; Eom C.B.
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:33
起始页码: 16186
结束页码: 16191
语种: 英语
英文关键词: Epitaxial thin films ; Spin-Hall effect ; Spin-orbit torque ; SrIrO3
Scopus关键词: heavy metal ; oxygen ; anisotropy ; Article ; controlled study ; electric conductivity ; electron spin resonance ; priority journal ; room temperature ; scanning transmission electron microscopy ; synchrotron radiation ; torque
英文摘要: Spin-orbit coupling (SOC), the interaction between the electron spin and the orbital angular momentum, can unlock rich phenomena at interfaces, in particular interconverting spin and charge currents. Conventional heavy metals have been extensively explored due to their strong SOC of conduction electrons. However, spin-orbit effects in classes of materials such as epitaxial 5d-electron transition-metal complex oxides, which also host strong SOC, remain largely unreported. In addition to strong SOC, these complex oxides can also provide the additional tuning knob of epitaxy to control the electronic structure and the engineering of spin-to-charge conversion by crystalline symmetry. Here, we demonstrate room-temperature generation of spin-orbit torque on a ferromagnet with extremely high efficiency via the spin-Hall effect in epitaxial metastable perovskite SrIrO3. We first predict a large intrinsic spin-Hall conductivity in orthorhombic bulk SrIrO3 arising from the Berry curvature in the electronic band structure. By manipulating the intricate interplay between SOC and crystalline symmetry, we control the spin-Hall torque ratio by engineering the tilt of the corner-sharing oxygen octahedra in perovskite SrIrO3 through epitaxial strain. This allows the presence of an anisotropic spin-Hall effect due to a characteristic structural anisotropy in SrIrO3 with orthorhombic symmetry. Our experimental findings demonstrate the heteroepitaxial symmetry design approach to engineer spin-orbit effects. We therefore anticipate that these epitaxial 5d transition-metal oxide thin films can be an ideal building block for low-power spintronics. © 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/163542
Appears in Collections:气候变化与战略

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作者单位: Nan, T., Department of Materials Science and Engineering, University of Wisconsin–Madison, Madison, WI 53706, United States; Anderson, T.J., Department of Materials Science and Engineering, University of Wisconsin–Madison, Madison, WI 53706, United States; Gibbons, J., Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853, United States; Hwang, K., Department of Physics and Centre for Quantum Materials, University of Toronto, Toronto, ON M5S 1A7, Canada; Campbell, N., Department of Physics, University of Wisconsin–Madison, Madison, WI 53706, United States; Zhou, H., Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, United States; Dong, Y.Q., Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, United States; Kim, G.Y., Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 37673, South Korea; Shao, D.F., Department of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588, United States; Paudel, T.R., Department of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588, United States; Reynolds, N., Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853, United States; Wang, X.J., Department of Electrical and Computer Engineering, Northeastern University, Boston, MA 02115, United States; Sun, N.X., Department of Electrical and Computer Engineering, Northeastern University, Boston, MA 02115, United States; Tsymbal, E.Y., Department of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588, United States; Choi, S.Y., Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 37673, South Korea; Rzchowski, M.S., Department of Physics, University of Wisconsin–Madison, Madison, WI 53706, United States; Kim, Y.B., Department of Physics and Centre for Quantum Materials, University of Toronto, Toronto, ON M5S 1A7, Canada, Canadian Institute for Advanced Research/Quantum Materials Program, Toronto, ON M5G 1Z8, Canada, School of Physics, Korea Institute for Advanced Study, Seoul, 130-722, South Korea; Ralph, D.C., Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853, United States, Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY 14853, United States; Eom, C.B., Department of Materials Science and Engineering, University of Wisconsin–Madison, Madison, WI 53706, United States

Recommended Citation:
Nan T.,Anderson T.J.,Gibbons J.,et al. Anisotropic spin-orbit torque generation in epitaxial SrIrO3 by symmetry design[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(33)
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