Spin current in ferromagnet/insulator/superconductor junctions

Details Spin current in ferromagnet/insulator/superconductor junctions Spin current in ferromagnet/insulator/superconductor junctions

1998-12-09

arxiv.org/abs/cond-mat/9812160v3

Physics

Condensed Matter

Superconductivity

14 pages, 11 figures

Scientific paper

10.1103/PhysRevB.60.3572

A theory of spin polarized tunneling spectroscopy based on a scattering theory is given for tunneling junctions between ferromagnets and d-wave superconductors. The spin filtering effect of an exchange field in the insulator is also treated. We clarify that the properties of the Andreev reflection are largely modified due to a presence of an exchange field in the ferromagnets, and consequently the Andreev reflected quasiparticle shows an evanescent-wave behavior depending on the injection angle of the quasiparticle. Conductance formulas for the spin current as well as the charge current are given as a function of the applied voltage and the spin-polarization in the ferromagnet for arbitrary barrier heights. It is shown that the surface bound states do not contribute to the spin current and that the zero-bias conductance peak expected for a d-wave superconductor splits into two peaks under the influence of the exchange interaction in the insulator.

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