Interfacial contributions to spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers

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

doi:10.1103/PhysRevB.101.020407

Title: Interfacial contributions to spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers

Journal Article · 17 January 2020 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.101.020407 · OSTI ID:1596692

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

Univ. of Nebraska, Lincoln, NE (United States)
King's College London (United Kingdom)

The thickness dependence of spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers is studied here using the first-principles nonequilibrium Green's function formalism combined with the Anderson disorder model. A systematic expansion in orthogonal vector spherical harmonics is used for the angular dependence of the torque. The dampinglike torque in Co/Pt and Co/Au bilayers can be described as a sum of the spin-Hall contribution, which increases with thickness in agreement with the spin-diffusion model, and a comparable interfacial contribution. The magnetoconductance in the plane perpendicular to the current in Co/Pt bilayers is of the order of a conductance quantum per interfacial atom, exceeding the prediction of the spin-Hall model by more than an order of magnitude. This indicates that the “spin-Hall magnetoresistance,” similarly to the dampinglike torque, has a large interfacial contribution unrelated to the spin-Hall effect.

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Research Organization:: Univ. of Nebraska, Lincoln, NE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0014189; DMR-1609776; DMR- 1420645

OSTI ID:: 1596692

Journal Information:: Physical Review B, Vol. 101, Issue 2; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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