Thermoelectric effect of a skyrmion crystal confined in a magnetic disk

Abstract

We theoretically propose that an electric voltage can be generated by a thermal gradient with a rotating skyrmion crystal confined in a magnetic disk. We find that the rotation of a skyrmion crystal induced by diffusive thermal magnon currents in the presence of the temperature gradient gives rise to spinmotive forces in the radial direction through coupling to conduction-electron spins. The amplitude of the 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.