Target skyrmion switching by current

Switching of a target skyrmion by a spin-polarized current. 
Yan Liu, Haifeng Du, Min Jia, and An Du 

Phys. Rev. B 91, 094425 (2015)

Topography of mz during the skyrmion polarity switching process. The insets on the lower right show mz in the disk plane. The insets on the upper right display the cutlines along the diameter through the disk center. (i) Variation of the Rs with simulation time.