Universität zu Köln

Poellath, S., Wild, J., Heinen, L., Meier, T. N. G., Kronseder, M., Tutsch, L., Bauer, A., Berger, H., Pfleiderer, C., Zweck, J., Rosch, A. and Back, C. H. (2017). Dynamical Defects in Rotating Magnetic Skyrmion Lattices. Phys. Rev. Lett., 118 (20). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

The chiral magnet Cu2OSeO3 hosts a Skyrmion lattice that may be equivalently described as a superposition of plane waves or a lattice of particlelike topological objects. A thermal gradient may break up the Skyrmion lattice and induce rotating domains, raising the question of which of these scenarios better describes the violent dynamics at the domain boundaries. Here, we show that in an inhomogeneous temperature gradient caused by illumination in a Lorentz transmission electron microscope different parts of the Skyrmion lattice can be set into motion with different angular velocities. Tracking the time dependence, we show that the constant rearrangement of domain walls is governed by dynamic 5-7 defects arranging into lines. An analysis of the associated defect density is described by Frank's equation and agrees well with classical 2D Monte Carlo simulations. Fluctuations of boundaries show a surgelike rearrangement of Skyrmion clusters driven by defect rearrangement consistent with simulations treating Skyrmions as point particles. Our findings underline the particle character of the Skyrmion.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Poellath, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wild, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heinen, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Meier, T. N. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kronseder, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tutsch, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bauer, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Berger, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pfleiderer, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zweck, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosch, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Back, C. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-230970
DOI:	10.1103/PhysRevLett.118.207205
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	118
Number:	20
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ROOM-TEMPERATURE; CRYSTALS Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23097