  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.
