Coherent quantum transport in ferromagnet/superconductor/ferromagnet structures

Z. C. Dong; R. Shen; Z. M. Zheng; D. Y. Xing; Z. D. Wang

doi:10.1103/PhysRevB.67.134515

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Coherent quantum transport in ferromagnet/superconductor/ferromagnet structures

Z. C. Dong, R. Shen, Z. M. Zheng, D. Y. Xing, Z. D. Wang

DOI 10.1103/PhysRevB.67.134515 · Physical Review B

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Abstract

The Blonder-Tinkham-Klapwijk (BTK) approach is extended to study coherent quantum transport in ferromagnet/superconductor/ferromagnet (FM/SC/SM) double tunnel junctions. In order to guarantee current conservation it is necessary to simultaneously consider spin-polarized electron currents along one direction and spin-polarized hole currents along the opposite direction, and to determine self-consistently the chemical potential in SC. It is found that all the reflection and transmission coefficients in BTK theory as well as conductance spectra oscillate with energy, exhibiting different behavior in the metallic and tunnel limits.