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Triplet supercurrent in ferromagnetic Josephson junctions by spin injection

By A. G. Mal'shukov and Arne Brataas

Abstract

We show that injecting nonequilibrium spins into the superconducting leads strongly enhances the stationary Josephson current through a superconductor-ferromagnet-superconductor junction. The resulting long-range super-current through a ferromagnet is carried by triplet Cooper pairs that are formed in s-wave superconductors by the combined effects of spin injection and exchange interaction. We quantify the exchange interaction in terms of Landau Fermi-liquid factors. The magnitude and direction of the long-range Josephson current can be manipulated by varying the angles of the injected polarizations with respect to the magnetization in the ferromagnet

Topics: Condensed Matter - Superconductivity, Condensed Matter - Mesoscale and Nanoscale Physics, Quantum Physics
Year: 2012
DOI identifier: 10.1103/PhysRevB.86.094517
OAI identifier: oai:arXiv.org:1208.5629

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