Universität zu Köln

Wild, Johannes ORCID: 0000-0002-6377-8085, Meier, Thomas N. G., Poellath, Simon, Kronseder, Matthias, Bauer, Andreas, Chacon, Alfonso ORCID: 0000-0003-0549-1366, Halder, Marco, Schowalter, Marco, Rosenauer, Andreas ORCID: 0000-0003-4742-0451, Zweck, Josef, Mueller, Jan, Rosch, Achim ORCID: 0000-0002-6586-5721, Pfleiderer, Christian ORCID: 0000-0001-7749-7965 and Back, Christian H. (2017). Entropy-limited topological protection of skyrmions. Sci. Adv., 3 (9). WASHINGTON: AMER ASSOC ADVANCEMENT SCIENCE. ISSN 2375-2548

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Abstract

Magnetic skyrmions are topologically protected whirls that decay through singular magnetic configurations known as Bloch points. We used Lorentz transmission electron microscopy to infer the energetics associated with the topological decay of magnetic skyrmions far from equilibrium in the chiral magnet Fe1-xCoxSi. We observed that the lifetime tau of the skyrmions depends exponentially on temperature, tau similar to tau(0) exp(Delta E/k(B)T). The prefactor tau(0) of this Arrhenius law changes by more than 30 orders of magnitude for small changes of the magnetic field, reflecting a substantial reduction of the lifetime of skyrmions by entropic effects and, thus, an extreme case of enthalpy-entropy compensation. Such compensation effects, being well known across many different scientific disciplines, affect topological transitions and, thus, topological protection on an unprecedented level.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wild, Johannes UNSPECIFIED orcid.org/0000-0002-6377-8085 UNSPECIFIED Meier, Thomas N. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Poellath, Simon UNSPECIFIED UNSPECIFIED UNSPECIFIED Kronseder, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Bauer, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Chacon, Alfonso UNSPECIFIED orcid.org/0000-0003-0549-1366 UNSPECIFIED Halder, Marco UNSPECIFIED UNSPECIFIED UNSPECIFIED Schowalter, Marco UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosenauer, Andreas UNSPECIFIED orcid.org/0000-0003-4742-0451 UNSPECIFIED Zweck, Josef UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, Jan UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosch, Achim UNSPECIFIED orcid.org/0000-0002-6586-5721 UNSPECIFIED Pfleiderer, Christian UNSPECIFIED orcid.org/0000-0001-7749-7965 UNSPECIFIED Back, Christian H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-218093
DOI:	10.1126/sciadv.1701704
Journal or Publication Title:	Sci. Adv.
Volume:	3
Number:	9
Date:	2017
Publisher:	AMER ASSOC ADVANCEMENT SCIENCE
Place of Publication:	WASHINGTON
ISSN:	2375-2548
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language REAL-SPACE OBSERVATION; LATTICE; COMPENSATION; DYNAMICS Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21809