Spontaneous spin current near the interface between unconventional superconductors and ferromagnets

Kazuhiro Kuboki; Hidenori Takahashi

doi:10.1103/PhysRevB.70.214524

paper

Spontaneous spin current near the interface between unconventional superconductors and ferromagnets

arXiv:cond-mat/0312672 · doi:10.1103/PhysRevB.70.214524

Abstract

We study theoretically the proximity effect between ferromagnets (F) and superconductors (S) with broken time-reversal symmetry ( $T$ ). A chiral $(p_{x} \pm i p_{y})$ -wave, and a $d_{x^{2} - y^{2}}$ -wave superconductor, the latter of which can form $T$ -breaking surface state, i.e., $(d_{x^{2} - y^{2}} \pm i s)$ -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 $(p_{x} \pm i p_{y})$ -wave superconductor, a spontaneous spin current flows along the interface, but not in the case of a $d_{x^{2} - y^{2}}$ -wave superconductor. For F/S $(p_{x} + i p_{y})$ /F trilayer system, total spin current can be finite while total charge current vanishes, if the magnetization of two F layers are antiparallel.

6 pages, 11 figures. Accepted for publication in Physical Review B

Spontaneous spin current near the interface between unconventional superconductors and ferromagnets

Abstract

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