Spin-relaxation and magnetoresistance in FM/SC/FM tunnel junctions
arXiv:cond-mat/0107402 · doi:10.1016/S0304-8853(01)00714-4
Abstract
The effect of spin relaxation on tunnel magnetoresistance (TMR) in a ferromagnet/superconductor/ferromagnet (FM/SC/FM) double tunnel junction is theoretically studied. The spin accumulation in SC is determined by balancing of the spin-injection rate and the spin-relaxation rate. In the superconducting state, the spin-relaxation time becomes longer with decreasing temperature, resulting in a rapid increase of TMR. The TMR of FM/SC/FM junctions provides a useful probe to extract information about spin-relaxation in superconductors.
3 pages, 2 figures, to appear in Journal of Magnetism and Magnetic Materials (proceedings of the 4th International Symposium on Metallic Multilayers, MML'01, Aachen, June 24-29, 2001)
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