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arXiv · 1603.04281

Theory of spin loss at metallic interfaces

K. D. Belashchenko·Alexey A. Kovalev·M. van Schilfgaarde
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Abstract

Interfacial spin-flip scattering plays an important role in magnetoelectronic devices. Spin loss at metallic interfaces is usually quantified by matching the magnetoresistance data for multilayers to the Valet-Fert model, while treating each interface as a fictitious bulk layer whose thickness is $δ$ times the spin-diffusion length. By employing the properly generalized circuit theory and the scattering matrix approaches, we derive the relation of the parameter $δ$ to the spin-flip transmission and reflection probabilities at an individual interface. It is found that $δ$ is proportional to the square root of the probability of spin-flip scattering. We calculate the spin-flip transmission probability for flat and rough Cu/Pd interfaces using the Landauer-Büttiker method based on the first-principles electronic structure and find $δ$ in reasonable agreement with experiment.

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K. D. Belashchenko, Alexey A. Kovalev, M. van Schilfgaarde. 2016-10-13. Theory of spin loss at metallic interfaces. https://doi.org/10.1103/physrevlett.117.207204

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