Spin accumulation induced resistance in mesoscopic ferromagnet/ superconductor junctions

Details Spin accumulation induced resistance in mesoscopic ferromagnet/ superconductor junctions Spin accumulation induced resistance in mesoscopic ferromagnet/ superconductor junctions

1999-01-28

arxiv.org/abs/cond-mat/9901323v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX 10 pages, 4 figures, submitted to Phys.Rev. Lett

Scientific paper

10.1103/PhysRevB.60.16549

We present a description of spin-polarized transport in mesoscopic ferromagnet-superconductor (F/S) systems, where the transport is diffusive, and the interfaces are transparent. It is shown that the spin reversal associated with Andreev reflection generates an excess spin density close to the F/S interface, which leads to a spin contact resistance. Expressions for the contact resistance are given for two terminal and four terminal geometries. In the latter the sign depends on the relative magnetization of the ferromagnetic electrodes.

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