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The formation of topological spin textures at the nanoscale has a significantimpact on the long-range order and dynamical response of magnetic materials. Westudy the relaxation mechanisms at the conical-to-helical phase transition inthe chiral magnet FeGe. By combining ac susceptibility, magnetic forcemicroscopy measurements and micromagnetic simulations, we demonstrate how themotion of magnetic topological defects, here edge dislocations, impacts thelocal formation of a stable helimagnetic spin structure. Although thesimulations show that the edge dislocations move with a velocity of about 100m/s through the helimagnetic background, their dynamics are observed to disturbthe magnetic order on the timescale of minutes due to pinning by randomlydistributed structural defects. The results corroborate the substantial impactof dislocation motions on the nanoscale spin structure in chiral magnets,revealing previously hidden effects on the formation of helimagnetic domainsand domain walls.

Dislocation-driven relaxation processes at the conical to helical phase transition in FeGe