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Local dynamics of topological magnetic defects in the itinerant helimagnet FeGe

Dussaux, A.; Schoenherr, P.; Koumpouras, K.; Chico, J.; Chang, K.; Lorenzelli, L.; Kanazawa, N.; Tokura, Y.; Garst, Markus; Bergman, A.; Degen, C. L.; Meier, D.

Chiral magnetic interactions induce complex spin textures including helical and conical spin spirals, as well as particle-like objects such as magnetic skyrmions and merons. These spin textures are the basis for innovative device paradigms and give rise to exotic topological phenomena, thus being of interest for both applied and fundamental sciences. Present key questions address the dynamics of the spin system and emergent topological defects. Here we analyse the micromagnetic dynamics in the helimagnetic phase of FeGe. By combining magnetic force microscopy, single-spin magnetometry and Landau–Lifschitz–Gilbert simulations 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 observation of stochastic instabilities in the micromagnetic structure provides insight to the spatio-temporal dynamics of itinerant helimagnets and topological defects, and discloses open challenges regarding their technological usage.

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DOI: 10.1038/ncomms12430
Zitationen: 31
Web of Science
Zitationen: 33
Zugehörige Institution(en) am KIT Institut für Theoretische Festkörperphysik (TFP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2016
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000128940
Erschienen in Nature Communications
Verlag Nature Research
Band 7
Heft 1
Seiten Art.-Nr.: 12430
Vorab online veröffentlicht am 18.08.2016
Nachgewiesen in Scopus
Web of Science
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