Spin-accumulation-induced resistance in mesoscopic ferromagnet-superconductor junctions
F. J. Jedema, B. J. van Wees, B. H. Hoving, A. T. Filip, T. M. Klapwijk
DOI 10.1103/PhysRevB.60.16549 · Physical Review B
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Abstract
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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