Spin Josephson effect with a single superconductor

TL;DR

This paper predicts a spin Josephson effect in a triplet superconductor with a ferromagnetic layer, leading to a measurable magnetization precession driven by a spin current.

Contribution

It introduces a novel spin Josephson effect mediated by a ferromagnetic layer in a triplet superconductor, with analytic expressions for interface bound states.

Findings

Predicted a measurable magnetization precession due to spin current.

Derived analytic expressions for bound states at the interface.

Established the ferromagnetic layer mediates spin coupling in triplet superconductors.

Abstract

A thin ferromagnetic layer on a bulk equal-spin-pairing triplet superconductor is shown to mediate a Josephson coupling between the spin $\uparrow$ and $\downarrow$ condensates of the superconductor. By deriving analytic expressions for the bound states at the triplet superconductor-ferromagnet interface, we show that this spin Josephson effect establishes an effective anisotropy axis in the ferromagnetic layer. The associated Josephson spin current is predicted to cause a measurable precession of the magnetization about the vector order parameter of the triplet superconductor.