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Spin-Imbalance and Magnetoresistance in Ferromagnet/Superconductor/Ferromagnet Double Tunnel Junctions

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arxiv cond-mat/9901300 v2 pith:XIA7D77U submitted 1999-01-27 cond-mat

S. Takahashi , H. Imamura , S. Maekawa This is my paper
classification cond-mat
keywords ferromagnetspintunnelvoltagebiasdoublemagnetoresistancesuperconductivity
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We theoretically study the spin-dependent transport in a ferromagnet/super- conductor/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 (TMR) by applying the bias voltage.

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