Thermally induced spin-transfer torques in superconductor/ferromagnet bilayers

TL;DR

This paper investigates how thermal gradients in superconductor/ferromagnet bilayers generate significant spin-transfer torques, leading to high domain wall velocities, with potential implications for magnetic memory and logic devices.

Contribution

It introduces a novel mechanism where thermally induced spin-transfer torques in superconductor/ferromagnet systems produce unprecedented domain wall velocities.

Findings

Thermally induced spin-transfer torques are significantly larger than previous predictions.

Giant thermoelectric effects and equal-spin pairing enhance domain wall motion.

Potential for high-speed magnetic switching in spintronic applications.

Abstract

Thermally induced magnetization dynamics is currently a flourishing field of research due to its potential application in information technology. We study the paradigmatic system of a magnetic domain wall in a thermal gradient which is interacting with an adjacent superconductor. The spin-transfer torques arising in this system due to the combined action of the giant thermoelectric effect and the creation of equal-spin pairs in the superconductor are large enough to give rise to high domain wall velocities $10^3$ times larger than previously predicted.