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Title: Anisotropic spin-orbit torque generation in epitaxial SrIrO 3 by symmetry design

Abstract

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 5 d -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 SrIrO 3 . We first predict a large intrinsic spin-Hall conductivity in orthorhombic bulk SrIrO 3 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 SrIrO 3 through epitaxial strain. This allows the presence of an anisotropic spin-Hall effect due to a characteristic structural anisotropy in SrIrO 3 with orthorhombic symmetry. Ourmore » experimental findings demonstrate the heteroepitaxial symmetry design approach to engineer spin-orbit effects. We therefore anticipate that these epitaxial 5 d transition-metal oxide thin films can be an ideal building block for low-power spintronics.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ORCiD logo; ; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1562600
Alternate Identifier(s):
OSTI ID: 1574305
Grant/Contract Number:  
[FG02-06ER46327; AC02-06CH11357]
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
[Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 116 Journal Issue: 33]; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; SrIrO3; epitaxial thin films; spin-Hall effect; spin-orbit torque

Citation Formats

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, Yong Baek, Ralph, D. C., and Eom, C. B. Anisotropic spin-orbit torque generation in epitaxial SrIrO 3 by symmetry design. United States: N. p., 2019. Web. doi:10.1073/pnas.1812822116.
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, Yong Baek, Ralph, D. C., & Eom, C. B. Anisotropic spin-orbit torque generation in epitaxial SrIrO 3 by symmetry design. United States. doi:10.1073/pnas.1812822116.
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, Yong Baek, Ralph, D. C., and Eom, C. B. Fri . "Anisotropic spin-orbit torque generation in epitaxial SrIrO 3 by symmetry design". United States. doi:10.1073/pnas.1812822116.
@article{osti_1562600,
title = {Anisotropic spin-orbit torque generation in epitaxial SrIrO 3 by symmetry design},
author = {Nan, T. and Anderson, T. J. and Gibbons, J. and Hwang, K. and Campbell, N. and Zhou, H. and Dong, Y. Q. and Kim, G. Y. and Shao, D. F. and Paudel, T. R. and Reynolds, N. and Wang, X. J. and Sun, N. X. and Tsymbal, E. Y. and Choi, S. Y. and Rzchowski, M. S. and Kim, Yong Baek and Ralph, D. C. and Eom, C. B.},
abstractNote = {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 5 d -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 SrIrO 3 . We first predict a large intrinsic spin-Hall conductivity in orthorhombic bulk SrIrO 3 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 SrIrO 3 through epitaxial strain. This allows the presence of an anisotropic spin-Hall effect due to a characteristic structural anisotropy in SrIrO 3 with orthorhombic symmetry. Our experimental findings demonstrate the heteroepitaxial symmetry design approach to engineer spin-orbit effects. We therefore anticipate that these epitaxial 5 d transition-metal oxide thin films can be an ideal building block for low-power spintronics.},
doi = {10.1073/pnas.1812822116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = [33],
volume = [116],
place = {United States},
year = {2019},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1073/pnas.1812822116

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