Generalized magnetoelectronic circuit theory and spin relaxation at interfaces in magnetic multilayers

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

doi:10.1103/physrevb.101.224405

Title: Generalized magnetoelectronic circuit theory and spin relaxation at interfaces in magnetic multilayers

Journal Article · Wed Jun 03 00:00:00 EDT 2020 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.101.224405· OSTI ID:1660068

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

^[1]

Univ. of Nebraska, Lincoln, NE (United States)
King's College, London (United Kingdom); National Renewable Energy Lab. (NREL), Golden, CO (United States)

Spin transport at metallic interfaces is an essential ingredient of various spintronic device concepts, such as giant magnetoresistance, spin-transfer torque, and spin pumping. Spin-orbit coupling plays an important role in many such devices. In particular, spin current is partially absorbed at the interface due to spin-orbit coupling. Here, we develop a general magnetoelectronic circuit theory and generalize the concept of spin-mixing conductance, accounting for various mechanisms responsible for spin-flip scattering. For the special case when exchange interactions dominate, we give a simple expression for the spin-mixing conductance in terms of the contributions responsible for spin relaxation (i.e., spin memory loss), spin torque, and spin precession. The spin memory loss parameter d is related to spin-flip transmission and reflection probabilities. There is no straightforward relation between spin torque and spin memory loss. We calculate the spin-flip scattering rates for N|N, F|N, and F|F interfaces using the Landauer-Büttiker method within the linear muffin-tin orbital method and determine the values of d using circuit theory.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Science Foundation (NSF); Engineering and Physical Sciences Research Council (EPSRC); Nebraska Research Initiative

Grant/Contract Number:: AC36-08GO28308; DMR-1609776; DMR-1420645; SC0014189

OSTI ID:: 1660068

Report Number(s):: NREL/JA-5F00-77314; MainId:26260; UUID:e11ba719-f5c4-4020-984e-1d23fd940dc0; MainAdminID:14041; TRN: US2203764

Journal Information:: Physical Review. B, Vol. 101, Issue 22; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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