Interplay between spin-relaxation and Andreev reflection in ferromagnetic wires with superconducting contacts

Details Interplay between spin-relaxation and Andreev reflection in ferromagnetic wires with superconducting contacts Interplay between spin-relaxation and Andreev reflection in ferromagnetic wires with superconducting contacts

1999-01-07

arxiv.org/abs/cond-mat/9901051v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figs

Scientific paper

10.1103/PhysRevB.60.15394

We analyze the change in the resistance of a junction between a diffusive ferromagnetic (F) wire and normal metal electrode, due to the onset of superconductivity (S) in the latter and a double Andreev scattering process leading to a complete internal reflection of a large fraction of the spin-polarized electrons back into the ferromagnet. The superconducting transition results in an additional contact resistance arising from the necessity to match spin-polarized current in F-wire to spin-less current in S-reservoir, which is comparable to the resistance of a piece of a F-wire with the length equal to the spin-relaxation length.

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