Fig. 4
From: Current-induced viscoelastic topological unwinding of metastable skyrmion strings
Micromagnetic simulations for a segmented skyrmion string. a Initial magnetic state of the simulations, which is metastable under zero current. b–d Snapshots of the current-induced dynamics of a segmented skyrmion string under j = 0.04: t = 250 (b), t = 500 (c), and t = 650 (d) in units of 1/(γJ) (see the Methods section). The movie is available in Supplementary Movie 1. Color wheels specify the x–y plane magnetization direction. The brightness of the color represents the z component of the magnetization; that is, the local magnetizations pointing toward the z direction are displayed as white. For the details of the calculation, see the Methods section
