Andreev Reflection In Ferromagnet-Superconductor Junctions

Details Andreev Reflection In Ferromagnet-Superconductor Junctions Andreev Reflection In Ferromagnet-Superconductor Junctions

1994-10-06

arxiv.org/abs/cond-mat/9410014v1

Phys. Rev. Lett. 74, 1657 (1995)

Physics

Condensed Matter

8 pages, RevTeX v3.0, including 3 encapsulated postscript figures

Scientific paper

10.1103/PhysRevLett.74.1657

The transport properties of a ferromagnet-superconductor (FS) junction are studied in a scattering formulation. Andreev reflection at the FS interface is strongly affected by the exchange interaction in the ferromagnet. The conductance G_FS of a ballistic point contact between F and S can be both larger or smaller than the value G_FN with the superconductor in the normal state, depending on the ratio of the exchange and Fermi energies. If the ferromagnet contains a tunnel barrier (I), the conductance G_FIFS exhibits resonances which do not vanish in linear response -- in contrast to the Tomasch oscillations for non-ferromagnetic materials.

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