Figure 4
Skyrmion generation with respect to current. (a) The dependency of number of skyrmions generated per second (generation frequency, f) on current density, j, for the anti-notch dimension of w = 20 nm and l = 30 nm. We changed j from 6.5 TAm−2 to 9.5 TAm−2 with the steps of 0.5 TAm−2 for various α/β ratios. β is remained at 0.3 while α is varied to get desired α/β ratio. (b) Drift velocity of skyrmions as a function of current density. Dashed lines in each figure are the linear fits of the corresponding data. The linear fits in (b) are used to extract the mobility (velocity per current density) of the skyrmions.
