Magnon spin current induced by triplet Cooper pair supercurrents

TL;DR

This paper demonstrates that supercurrents carried by triplet Cooper pairs in superconductors can induce magnon spin currents in adjacent ferromagnetic insulators, revealing a novel method of converting supercurrents into spin currents.

Contribution

It introduces a mechanism where triplet Cooper pair supercurrents generate magnon spin currents at superconductor-ferromagnet interfaces, a novel conversion process.

Findings

Triplet supercurrents induce magnon spin currents.

Charge and spin supercurrents produce similar effects.

Potential for spintronic applications using supercurrents.

Abstract

At the interface between a ferromagnetic insulator and a superconductor there is a coupling between the spins of the two materials. We show that when a supercurrent carried by triplet Cooper pairs flows through the superconductor, the coupling induces a magnon spin current in the adjacent ferromagnetic insulator. The effect is dominated by Cooper pairs polarized in the same direction as the ferromagnetic insulator, so that charge and spin supercurrents produce similar results. Our findings demonstrate a way of converting Cooper pair supercurrents to magnon spin currents.