Spin current in ferromagnet/insulator/superconductor junctions

Abstract

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.

14 pages, 11 figures

References in corpus (6)

• Andreev Reflection In Ferromagnet-Superconductor Junctions
• Tunneling into Current-Carrying Surface States of High T${}_c$ Superconductors
• Quasiparticle transport and localization in high-T_c superconductors
• Theory of Spin polarized Tunneling in Superconducting Sr2RuO4
• Influences of broken time-reversal symmetry on the d.c. Josephson effects in d-wave superconductors
• Spin Injection into a Luttinger Liquid

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