Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Dussaux, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schoenherr, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Koumpouras, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chico, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chang, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenzelli, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kanazawa, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tokura, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garst, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bergman, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Degen, C. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Meier, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Keywords Language REAL-SPACE OBSERVATION; SKYRMION LATTICE; CHIRAL MAGNET; SPIN; DIAMOND; MICROSCOPY; CRYSTAL; ORDER Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26829