Spontaneous spin current near the interface between unconventional superconductors and ferromagnets

Abstract

We study theoretically the proximity effect between ferromagnets (F) and superconductors (S) with broken time-reversal symmetry (T). A chiral (px±ipy)-wave and a dx2−y2-wave superconductor, the latter of which can form T-breaking surface state—i.e., (dx2−y2±is) state—are considered for the S side. The spatial variations of the superconducting order parameters and the magnetization are determined by solving the Bogoliubov—de Gennes equation. In the case of a chiral (px±ipy)-wave superconductor, a spontaneous spin current flows along the interface, but not in the case of a dx2−y2-wave superconductor. For a F∕S(px±ipy)∕F trilayer system, total spin current can be finite while total charge current vanishes, if the magnetizations of two F layers are antiparallel.

Source-reported materials — not catalogue approval

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