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

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [2]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. King's College London (United Kingdom)
Publication Date:
Research Org.:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1596692
Grant/Contract Number:  
SC0014189; DMR-1609776; DMR- 1420645
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Spin Hall magnetoresistance; Spin torque; First-principles calculations; Nonequilibrium Green's function

Citation Formats

Belashchenko, K. D., Kovalev, Alexey A., and van Schilfgaarde, M. Interfacial contributions to spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers. United States: N. p., 2020. Web. doi:10.1103/PhysRevB.101.020407.
Belashchenko, K. D., Kovalev, Alexey A., & van Schilfgaarde, M. Interfacial contributions to spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers. United States. https://doi.org/10.1103/PhysRevB.101.020407
Belashchenko, K. D., Kovalev, Alexey A., and van Schilfgaarde, M. Fri . "Interfacial contributions to spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers". United States. https://doi.org/10.1103/PhysRevB.101.020407. https://www.osti.gov/servlets/purl/1596692.
@article{osti_1596692,
title = {Interfacial contributions to spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers},
author = {Belashchenko, K. D. and Kovalev, Alexey A. and van Schilfgaarde, M.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.101.020407},
journal = {Physical Review B},
number = 2,
volume = 101,
place = {United States},
year = {2020},
month = {1}
}

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