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Local dynamics of topological magnetic defects in the itinerant helimagnet FeGe.
Swiss Fed Inst Technol, Dept Phys, Otto Stern Weg 1, CH-8093 Zurich, Switzerland.
Swiss Fed Inst Technol, Dept Mat, Vladimir Prelog Weg 4, CH-8093 Zurich, Switzerland.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2016 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 7, 12430Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2016. Vol. 7, 12430
National Category
Condensed Matter Physics
URN: urn:nbn:se:uu:diva-291374DOI: 10.1038/ncomms12430ISI: 000381773100001PubMedID: 27535899OAI: diva2:925377
Swedish Research CouncileSSENCE - An eScience Collaboration
Available from: 2016-05-02 Created: 2016-05-02 Last updated: 2016-10-05Bibliographically approved

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