Anisotropic spin-current spectroscopy of ferromagnetic superconducting gap symmetries

強磁性超伝導ギャップ対称性の異方的スピン流分光法

舟木 博志*; 山影 相*; 松尾 衛

Funaki, Hiroshi*; Yamakage, Ai*; Matsuo, Mamoru

We develop a microscopic theory of tunneling spin transport at the magnetic interface between a ferromagnetic insulator (FI) and a ferromagnetic superconductor (FSC) driven by ferromagnetic resonance. We show that the spin susceptibilities of the FSC can be extracted from the spin currents by tuning the easy axis of the FI, and thus the spin currents can be a probe for the symmetries of the spin-triplet Cooper pairing. Our results will offer a route to exploiting the synergy of magnetism and superconductivities for spin devices.