SPIN IMBALANCE AND MAGNETORESISTANCE IN FERROMAGNET/SUPERCONDUCTOR/FERROMAGNET DOUBLE TUNNEL JUNCTIONS
SPIN IMBALANCE AND MAGNETORESISTANCE IN FERROMAGNET/SUPERCONDUCTOR/FERROMAGNET DOUBLE TUNNEL JUNCTIONS
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DOI：
10.1103/physrevlett.82.3911
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发表时间：
1999-01
影响因子：
8.6
通讯作者：
S. Takahashi;H. Imamura;S. Maekawa
中科院分区：
文献类型：
--
作者：
S. Takahashi;H. Imamura;S. Maekawa
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.
