  We study the Skyrmion dynamics in thin films under a temperature gradient.
Our numerical simulations show that both single and multiple Skyrmions in a
crystal move towards the high temperature region, which is contrary to particle
diffusion. Noticing a similar effect in the domain wall motion, we employ a
theory based on magnon dynamics to explain this counterintuitive phenomenon.
Unlike the temperature driven domain wall motion, the Skyrmion's topological
charge plays an important role, and a transverse Skyrmion motion is observed.
Our theory turns out to be in agreement with numerical simulations, both
qualitatively and quantitatively. Our calculation indicated that a very
promising Skyrmion dynamic phenomenon can be observed in experiments.
