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First-principles calculation of spin-orbit torque in a Co/Pt bilayer

Journal Article · · Physical Review Materials
 [1];  [2];  [3]
  1. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy and Nebraska Center for Materials and Nanoscience; University of Nebraska - Lincoln
  2. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy and Nebraska Center for Materials and Nanoscience
  3. Kings College London, London (United Kingdom). Dept. of Physics
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.
Research Organization:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0014189
OSTI ID:
1497407
Alternate ID(s):
OSTI ID: 1492754
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 1 Vol. 3; ISSN PRMHAR; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Electrically driven spin torque and dynamical Dzyaloshinskii-Moriya interaction in magnetic bilayer systems journal July 2019
Spin-orbit torques and their associated effective fields from gigahertz to terahertz journal January 2020
Interfacial contributions to spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers journal January 2020
Magnonic analog of the Edelstein effect in antiferromagnetic insulators journal January 2020
Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems journal September 2019
Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems text January 2018
Interfacial contributions to spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers text January 2019
Magnonic Analogue of Edelstein Effect in Antiferromagnetic Insulators text January 2019

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