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

Belashchenko, K. D.; Kovalev, Alexey A.; van Schilfgaarde, M.

doi:10.1103/PhysRevMaterials.3.011401

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

Journal Article · 29 January 2019 · Physical Review Materials

DOI: https://doi.org/10.1103/PhysRevMaterials.3.011401 · OSTI ID:1497407

Belashchenko, K. D. ^[1]; Kovalev, Alexey A. ^[2]; van Schilfgaarde, M. ^[3]

Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy and Nebraska Center for Materials and Nanoscience; University of Nebraska - Lincoln
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

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.

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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

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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