Proximity effect-assisted absorption of spin currents in superconductors
Jan Petter Morten, Arne Brataas, Gerrit E. W. Bauer, Wolfgang Belzig,, and Yaroslav Tserkovnyak
TL;DR
This paper presents a theoretical study of how spin currents are absorbed in superconductors, considering interface effects and spin-flip scattering, aligning with recent experimental findings.
Contribution
It introduces a comprehensive theoretical model that accounts for inverse proximity effects and energy-dependent spin-flip scattering in superconductor spin transport.
Findings
The model matches experimental FMR linewidth broadening in Nb|permalloy bilayers.
Inverse proximity effect significantly influences spin current absorption.
Temperature dependence of spin transport properties is characterized.
Abstract
The injection of pure spin current into superconductors by the dynamics of a ferromagnetic contact is studied theoretically. Taking into account suppression of the order parameter at the interfaces (inverse proximity effect) and the energy-dependence of spin-flip scattering, we determine the temperature-dependent ferromagnetic resonance linewidth broadening. Our results agree with recent experiments in Nb|permalloy bilayers [C. Bell et al., arXiv:cond-mat/0702461].
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