Fig. 4: Ensemble velocity evolution with the number of included skyrmions.
From: Skyrmion motion and partitioning of domain wall velocity driven by repulsive interactions
a Ensemble velocity versus the number of skyrmions Ns at various field strengths. b Ensemble mobility versus Ns. Black dots are simulation results and red dots are given by ũdw / (Ns + 1) with ũdw representing the mobility of a single domain wall. Lines are guides to eyes. The strengths of perpendicular magnetic anisotropy and Dzyaloshinskii-Moriya interaction are Ku = 0.8 MJm−3 and D = 3.5 mJm−2, respectively.
