Thermoelectric effect of skyrmion crystal confined in a magnetic disk

Abstract

We theoretically propose that an electric voltage can be generated by thermal gradient with a rotating skyrmion crystal confined in a magnetic disk. We find that the rotation of skyrmion crystal induced by diffusive thermal magnon currents in the presence of temperature gradient gives rise to spinmotive forces in the radial direction through coupling to conduction-electron spins. The amplitude of generated spinmotive force is larger for a larger temperature gradient at a lower temperature. The proposed phenomenon can be exploited as spintronics-based thermoelectric devices to realize the conversion of heat to electricity.