Universität zu Köln

Schuette, Christoph and Rosch, Achim ORCID: 0000-0002-6586-5721 (2014). Dynamics and energetics of emergent magnetic monopoles in chiral magnets. Phys. Rev. B, 90 (17). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

The formation and destruction of topologically quantized magnetic whirls, i.e., the so-called skyrmions, in chiral magnets is driven by the creation and motion of singular hedgehog defects. These Bloch points can be identified with emergent magnetic monopoles and antimonopoles. We investigate how the energetics of and forces between monopoles and antimonopoles influence their creation rate and dynamics. We study a single skyrmion line defect in the helical phase using both micromagnetic simulations and a Ginzburg-Landau analysis. Monopole-antimonopole pairs are created in a thermally activated process, largely controlled by the (core) energy of the monopole. The force between monopoles and antimonopoles is linear in distance and described by a string tension. The sign and size of the string tension determines the stability of the phases and the velocity of the monopoles.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schuette, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosch, Achim UNSPECIFIED orcid.org/0000-0002-6586-5721 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-423058
DOI:	10.1103/PhysRevB.90.174432
Journal or Publication Title:	Phys. Rev. B
Volume:	90
Number:	17
Date:	2014
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SKYRMION LATTICE; PHASE; MNSI Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42305