First-principles calculation of spin-orbit torque in a Co/Pt bilayer
Abstract
The angular dependence of spin-orbit torque in a disordered Co/Pt bilayer is calculated using a first-principles nonequilibrium Green's function formalism with an explicit supercell averaging over Anderson disorder. In addition to the usual dampinglike and fieldlike terms, the odd torque contains a sizable planar Hall-like term (m∙E)m × (z × m) whose contribution to current-induced damping is consistent with experimental observations. The dampinglike and planar Hall-like torquances depend weakly on disorder strength, while the fieldlike torquance declines with increasing disorder. The torques that contribute to damping are almost entirely due to spin-orbit coupling on the Pt atoms, but the fieldlike torque does not require it.
- Authors:
-
- Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy and Nebraska Center for Materials and Nanoscience
- Kings College London, London (United Kingdom). Dept. of Physics
- Publication Date:
- Research Org.:
- Univ. of Nebraska, Lincoln, NE (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1497407
- Alternate Identifier(s):
- OSTI ID: 1492754
- Grant/Contract Number:
- SC0014189
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Belashchenko, K. D., Kovalev, Alexey A., and van Schilfgaarde, M. First-principles calculation of spin-orbit torque in a Co/Pt bilayer. United States: N. p., 2019.
Web. doi:10.1103/PhysRevMaterials.3.011401.
Belashchenko, K. D., Kovalev, Alexey A., & van Schilfgaarde, M. First-principles calculation of spin-orbit torque in a Co/Pt bilayer. United States. https://doi.org/10.1103/PhysRevMaterials.3.011401
Belashchenko, K. D., Kovalev, Alexey A., and van Schilfgaarde, M. Tue .
"First-principles calculation of spin-orbit torque in a Co/Pt bilayer". United States. https://doi.org/10.1103/PhysRevMaterials.3.011401. https://www.osti.gov/servlets/purl/1497407.
@article{osti_1497407,
title = {First-principles calculation of spin-orbit torque in a Co/Pt bilayer},
author = {Belashchenko, K. D. and Kovalev, Alexey A. and van Schilfgaarde, M.},
abstractNote = {The angular dependence of spin-orbit torque in a disordered Co/Pt bilayer is calculated using a first-principles nonequilibrium Green's function formalism with an explicit supercell averaging over Anderson disorder. In addition to the usual dampinglike and fieldlike terms, the odd torque contains a sizable planar Hall-like term (m∙E)m × (z × m) whose contribution to current-induced damping is consistent with experimental observations. The dampinglike and planar Hall-like torquances depend weakly on disorder strength, while the fieldlike torquance declines with increasing disorder. The torques that contribute to damping are almost entirely due to spin-orbit coupling on the Pt atoms, but the fieldlike torque does not require it.},
doi = {10.1103/PhysRevMaterials.3.011401},
journal = {Physical Review Materials},
number = 1,
volume = 3,
place = {United States},
year = {Tue Jan 29 00:00:00 EST 2019},
month = {Tue Jan 29 00:00:00 EST 2019}
}
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