Spin imbalance and magnetoresistance in ferromagnet/superconductor/ferromagnet double tunnel junctions

S. Takahashi, H. Imamura, S. Maekawa

Research output: Contribution to journalArticlepeer-review

175 Citations (Scopus)

Abstract

We theoretically study the spin-dependent transport in a ferromagnet/superconductor/ferromagnet double tunnel junction. The tunneling current in the antiferromagnetic alignment of the magnetizations gives rise to a spin imbalance in the superconductor. The resulting nonequilibrium spin density strongly suppresses the superconductivity with increase of bias voltage and destroys it at a critical voltage Vc. The results provide a new method not only for measuring the spin polarization of ferromagnets but also for controlling superconductivity and tunnel magnetoresistance by applying a bias voltage.

Original languageEnglish
Pages (from-to)3911-3914
Number of pages4
JournalPhysical review letters
Volume82
Issue number19
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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