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Resonant transmission of normal electrons through Andreev states in ferromagnets

A. Kadigrobov, R. I. Shekhter, M. Jonson, Z. G. Ivanov

DOI 10.1103/PhysRevB.60.14593 · Physical Review B

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Abstract

Giant oscillations of the conductance of a superconductor-ferromagnet-superconductor Andreev interferometer are predicted. The effect is due to the resonant transmission of normal electrons through Andreev levels when the voltage V applied to the ferromagnet is close to 2h0/e (h0 is the spin-dependent part of the electron energy). The effect of bias voltage and phase difference between the superconductors on the current and the differential conductance is presented. These effects allow a direct spectroscopy of Andreev levels in the ferromagnet.

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