Spontaneous spin-polarized currents in superconductor-ferromagnetic metal heterostructures
M. Krawiec, B. L. Györffy, J. F. Annett
DOI 10.1103/PhysRevB.66.172505 · Physical Review B
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Abstract
We study a simple microscopic model for thin, ferromagnetic, metallic layers on a 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 self-consistent with respect to the pairing amplitude χ, spin polarization m→, and spontaneous current js, we show that not only are there Andreev bound states in the ferromagnet, but when their energies En 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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