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.

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• Spin dynamics
• Spintronics
• 2-dimensional systems
• Chiral magnets
• Energy materials
• Noncollinear magnets
• Thermoelectrics
• Landau-Lifschitz-Gilbert equation
• Micromagnetic modeling