Dussaux, A., Schoenherr, P., Koumpouras, K., Chico, J., Chang, K., Lorenzelli, L., Kanazawa, N., Tokura, Y., Garst, M., Bergman, A., Degen, C. L. and Meier, D. (2016). Local dynamics of topological magnetic defects in the itinerant helimagnet FeGe. Nat. Commun., 7. LONDON: NATURE PUBLISHING GROUP. ISSN 2041-1723

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Abstract

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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Dussaux, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schoenherr, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Koumpouras, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chico, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chang, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lorenzelli, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kanazawa, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tokura, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garst, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bergman, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Degen, C. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meier, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-268299
DOI: 10.1038/ncomms12430
Journal or Publication Title: Nat. Commun.
Volume: 7
Date: 2016
Publisher: NATURE PUBLISHING GROUP
Place of Publication: LONDON
ISSN: 2041-1723
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
REAL-SPACE OBSERVATION; SKYRMION LATTICE; CHIRAL MAGNET; SPIN; DIAMOND; MICROSCOPY; CRYSTAL; ORDERMultiple languages
Multidisciplinary SciencesMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/26829

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