Anisotropic superconducting spin transport at magnetic interfaces

Ominato, Yuya*; Yamakage, Ai*; Matsuo, Mamoru

We present a theoretical investigation of anisotropic superconducting spin transport at a magnetic interface between a -wave superconductor and a ferromagnetic insulator. Our formulation describes the ferromagnetic resonance modulations due to spin current generation depending on spin-triplet Cooper pair, including the frequency shift and enhanced Gilbert damping, in a unified manner. We find that the Cooper pair symmetry is detectable from the qualitative behavior of the ferromagnetic resonance modulation. Our theory paves the way toward anisotropic superconducting spintronics.