Magnon Spin Current Induced by Triplet Cooper Pair Supercurrents

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.

Automated summary

At the interface between a ferromagnetic insulator and a superconductor, a coupling between the spins of the two materials results in the induction of a magnon spin current in the adjacent ferromagnetic insulator by a supercurrent carried by triplet Cooper pairs. This effect is dominated by Cooper pairs polarized in the same direction as the ferromagnetic insulator, showing that charge and spin supercurrents produce similar results in this system. This study demonstrates a method of converting Cooper pair supercurrents into magnon spin currents.