ac Josephson effect induced by spin injection

A. G. Mal’shukov; Arne Brataas

doi:10.1103/PhysRevB.82.144511

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ac Josephson effect induced by spin injection

A. G. Mal’shukov, Arne Brataas

DOI 10.1103/PhysRevB.82.144511 · Physical Review B

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Abstract

Pure spin currents can be injected and detected in conductors via ferromagnetic contacts. We consider the case when the conductors become superconducting. A dc pure spin current flowing in one superconducting wire toward another superconductor via a ferromagnet contact induces ac voltage oscillations caused by Josephson tunneling of condensate electrons. Quasiparticles simultaneously counterflow resulting in zero total electric current through the contact. The Josephson oscillations can be accompanied by Carlson-Goldman collective modes leading to a resonance in the voltage oscillation amplitude.