Abstract
We theoretically analyzed the Andreev reflection in the ferromagnetic-metal(FM)/ nonmagnetic-metal(NM)/ superconductor(SC) double junctions with a special attention to the electron interference effect in the NM layer. In our previous work [Phys. Rev. B 79, 212570 (2009)] we found that the conductance oscillates as a function of the bias voltage due to the geometrical resonance, and the period of the conductance oscillation is proportional to the square-root of the exchange field. Here, by extending the previous work, we showed that the period of the conductance oscillation decreases if we consider the proximity effect at the NM/SC interface. We also showed that the period of the oscillation is proportional to the square-root of the exchange field even if we consider the proximity effect.
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