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

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

Journal Article · Fri Jan 17 00:00:00 EST 2020 · Physical Review B

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

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

Univ. of Nebraska, Lincoln, NE (United States); University of Nebraska - Lincoln
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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0014189

OSTI ID:: 1596692

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

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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