Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Surface Magnetism I (jointly with O)

MA 28.7: Vortrag

Mittwoch, 9. März 2016, 11:15–11:30, H31

Local dynamics of topological magnetic defects imaged by magnetic force microscopy — •Peggy Schönherr¹, Anders Bergman², Markus Garst³, Yoshi Tokura^4,5, Christian Degen¹, Manfred Fiebig¹, and Dennis Meier¹ — ¹ETH Zürich, Switzerland — ²Uppsala University, Sweden — ³Universität zu Köln, Germany — ⁴University of Tokyo, Japan — ⁵Riken, Japan

Chiral magnetic interactions induce complex spin textures, including helical and conical spin waves, as well as particle-like objects (skyrmions or merons), forming the basis for innovative device paradigms and exotic topological phenomena. Present key questions address the dynamics of the spin system and emergent topological defects. Here we discuss the micromagnetic dynamics in the helimagnetic phase of FeGe using magnetic force microscopic. We show that the nanoscale dynamics are governed by the depinning and subsequent motion of magnetic edge dislocations. The motion of these topologically stable objects triggers perturbations that can propagate over mesoscopic length scales. The experimental observation of stochastic instabilities in the micromagnetic structure provides new insight to the spatio-temporal dynamics of itinerant helimagnets and topological defects, and discloses novel challenges regarding their technological usage.