Tunneling and Transport in Clean Ferromagnet-Superconductor Heterostructures

ORAL

Abstract

We study charge and spin transport in clean Ferromagnet (F)-Superconductor (S) layered structures. By combining a transfer matrix method with a numerical self-consistent solution of the Bogoliubov-de Gennes (BdG) equations, we compute the spin dependent tunneling conductance in F-F-S trilayers in a range of exchange fields and layer thicknesses. In particular, we investigate the dependence of the tunneling conductance on the angle $\alpha$ between the magnetizations in two F layers. We find a variety of non-monotonic and switching behaviors in these heterostructures. We also present results for charge and spin transport in S-F-F-S Josephson junctions.

*C.-T. Wu and O. T. Valls are supported in part by IARPA under Grant No. N66001-12-1-2023. C.-T. Wu is also supported by the University of Minnesota's Doctoral Dissertation Fellowship

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Authors

  • Chien-Te Wu

    • School of Physics and Astronomy, University of Minnesota

  • Oriol Valls

    • School of Physics and Astronomy, University of Minnesota
    • University of Minnesota, Minneapolis

  • Klaus Halterman

    • Michelson Lab, Physics Division, Naval Air Warfare Center