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.
- 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 = {Fri Jan 17 00:00:00 EST 2020},
month = {Fri Jan 17 00:00:00 EST 2020}
}
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