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Spontaneous Spin Polarized Currents in Superconductor-Ferromagnetic Metal Heterostructures

M. Krawiec·B. L. Gyorffy·J. F. Annett
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Abstract

We study a simple microscopic model for thin, ferromagnetic, metallic layers on semi-infinite bulk superconductor. We find that for certain values of the exchange spliting, on the ferromagnetic side, the ground states of such structures feature spontaneously induced spin polarized currents. Using a mean-field theory, which is selfconsistent with respect to the pairing amplitude $χ$, spin polarization $\vec{m}$ and the spontaneous current $\vec{j}_s$, we show that not only there are Andreev bound states in the ferromagnet but when their energies $E_n$ are near zero they support spontaneous currents parallel to the ferromagnetic-superconducting interface. Moreover, we demonstrate that the spin-polarization of these currents depends sensitively on the band filling.

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M. Krawiec, B. L. Gyorffy, J. F. Annett. 2002-03-08. Spontaneous Spin Polarized Currents in Superconductor-Ferromagnetic Metal Heterostructures. https://doi.org/10.1103/physrevb.66.172505

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