Wild, Johannes and Meier, Thomas N. G. and Poellath, Simon and Kronseder, Matthias and Bauer, Andreas and Chacon, Alfonso and Halder, Marco and Schowalter, Marco and Rosenauer, Andreas and Zweck, Josef and Mueller, Jan and Rosch, Achim and Pfleiderer, Christian and Back, Christian H. (2017) Entropy-limited topological protection of skyrmions. SCIENCE ADVANCES, 3 (9): e1701704. ISSN 2375-2548,
Full text not available from this repository. (Request a copy)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: | Article |
|---|---|
| Uncontrolled Keywords: | REAL-SPACE OBSERVATION; MAGNETIC SKYRMIONS; LATTICE; COMPENSATION; DYNAMICS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Back > Group Christian Back Physics > Institute of Experimental and Applied Physics > Chair Professor Back > Group Josef Zweck |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:15 |
| Last Modified: | 26 Feb 2019 12:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1198 |
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