Anisotropic superconducting spin transport at magnetic interfaces

TL;DR

This paper develops a theoretical framework for understanding how anisotropic superconducting spin transport occurs at magnetic interfaces, revealing how Cooper pair symmetry influences ferromagnetic resonance behaviors.

Contribution

It introduces a unified theory linking spin-triplet Cooper pairs to ferromagnetic resonance modulations at magnetic interfaces, advancing superconducting spintronics.

Findings

Cooper pair symmetry affects ferromagnetic resonance behavior.

Frequency shift and damping are modulated by spin-triplet pairs.

Theory enables detection of Cooper pair symmetry through FMR.

Abstract

We present a theoretical investigation of anisotropic superconducting spin transport at a magnetic interface between a p-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.