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Chiral magnetic interactions induce complex spin textures including helicaland conical spin waves, as well as particle-like objects such as magneticskyrmions and merons. These spin textures are the basis for innovative deviceparadigms and give rise to exotic topological phenomena, thus being of interestfor both applied and fundamental sciences. Present key questions address thedynamics of the spin system and emergent topological defects. Here we analyzethe micromagnetic dynamics in the helimagnetic phase of FeGe. By combiningmagnetic force microscopy, single-spin magnetometry, andLandau-Lifschitz-Gilbert simulations we show that the nanoscale dynamics aregoverned by the depinning and subsequent motion of magnetic edge dislocations.The motion of these topologically stable objects triggers perturbations thatcan propagate over mesoscopic length scales. The observation of stochasticinstabilities in the micromagnetic structure provides new insight to thespatio-temporal dynamics of itinerant helimagnets and topological defects, anddiscloses novel challenges regarding their technological usage.

Local dynamics of topological magnetic defects in the itinerant helimagnet FeGe