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Huge nonequilibrium magnetoresistance in hybrid superconducting spin valves

F. Giazotto, F. Taddei, Rosario Fazio, F. Beltram

cond-mat.supr-conarXiv:cond-mat/0603555

Abstract

A hybrid ferromagnet-superconductor spin valve is proposed. Its operation relies on the interplay between nonequilibrium transport and proximity-induced exchange coupling in superconductors. Huge tunnel magnetoresistance values as large as some 106% can be achieved in suitable ferromagnet-superconductor combinations under proper voltage biasing. The controllable spin-filter nature of the structure combined with its intrinsic simplicity make this setup attractive for low-temperature spintronic applications where reduced power dissipation is an additional requirement.

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