Dynamics of spin transport in voltage-biased Josephson junctions

Erhai Zhao*, J. A. Sauls

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

We investigate spin transport in voltage-biased spin-active Josephson junctions. The interplay of spin filtering, spin mixing, and multiple Andreev reflection leads to nonlinear voltage dependence of the dc and ac spin current. We compute the voltage characteristics of the spin current (IS) for superconductor-ferromagnet-superconductor Josephson junctions. The subharmonic gap structure of IS(V) is shown to be sensitive to the degree of spin mixing generated by the ferromagnetic interface, and exhibits a pronounced even-odd effect associated with spin transport during multiple Andreev reflection processes. For strong spin mixing both the magnitude and the direction of the dc spin current can be sensitively controlled by the bias voltage.

Original languageEnglish (US)
Article number206601
JournalPhysical review letters
Volume98
Issue number20
DOIs
StatePublished - May 16 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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