Conductance oscillation due to the geometrical resonance in FNS double junctions

Details Conductance oscillation due to the geometrical resonance in FNS double junctions Conductance oscillation due to the geometrical resonance in FNS double junctions

2009-06-26

arxiv.org/abs/0906.4863v1

Phys. Rev. B 79, 212507 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.79.212507

We theoretically analyzed the Andreev reflection in ferromagnetic metal/nonmagnetic metal/superconductor double junctions with special attention to the electron interference effect in the nonmagnetic metal layer. We showed that the conductance oscillates as a function of the bias voltage due to the geometrical resonance. We found that the exchange field, and therefore the spin polarization of the ferromagnetic metal can be determined from the period of the conductance oscillation, which is proportional to the square root of the exchange field.

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