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 · Tue Jan 29 00:00:00 EST 2019 · Physical Review Materials

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

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

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)

Grant/Contract Number:: SC0014189

OSTI ID:: 1497407

Alternate ID(s):: OSTI ID: 1492754

Journal Information:: Physical Review Materials, Vol. 3, Issue 1; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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