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  Skyrmion States in Disk Geometry

Winkler, T. B., Litzius, K., de Lucia, A., Weißenhofer, M., Fangohr, H., & Kläui, M. (2021). Skyrmion States in Disk Geometry. Physical Review Applied, 16(4): 044014. doi:10.1103/PhysRevApplied.16.044014.

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PhysRevApplied.16.044014.pdf (Publisher version), 4MB
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2021
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 Creators:
Winkler, T. B.1, Author
Litzius, K.2, Author
de Lucia, A.1, Author
Weißenhofer, M.3, Author
Fangohr, H.4, 5, 6, Author              
Kläui, M.1, Author
Affiliations:
1Institute of Physics, Johannes Gutenberg Universtät, ou_persistent22              
2Department of Materials Science and Engineering, Massachusetts Institute of Technology, ou_persistent22              
3Fachbereich Physik, Universität Konstanz, ou_persistent22              
4Computational Science, Scientific Service Units, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3267028              
5European XFEL, ou_persistent22              
6University of Southampton, ou_persistent22              

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 Abstract: In this work, we explore the stability of magnetic skyrmions confined in a disk geometry by analyzing how to switch a skyrmionic state in a circular disk into a uniformly magnetized state when applying an external magnetic field. The technologically highly relevant energy barrier between the skyrmion state and the uniformly magnetized state is a key parameter needed for lifetime calculations. In an infinite sample, this relates to the out-of-plane rupture field against the skyrmion-core direction, while in confined geometries the topological charge can also be changed by interactions with the sample edges. We find that annihilating a skyrmion with an applied field in the direction of the core magnetization—we call this expulsion—the energy barrier to the uniform state is generally around one order of magnitude lower than the annihilation via the rupture of the core in the disk center, which is observed when the applied field is acting in the direction opposite to the core magnetization. For the latter case a Bloch point (BP) needs to be nucleated to change the topological charge to zero. We find that the former case can be realistically calculated using micromagnetic simulations but that the annihilation via rupture, involving a Bloch point, needs to be calculated with the Heisenberg model because the high magnetization gradients present during the annihilation process cannot be accurately described within the micromagnetic framework.

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Language(s): eng - English
 Dates: 2021-07-312020-12-162021-09-222021-10-11
 Publication Status: Published online
 Pages: -
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 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevApplied.16.044014
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Title: Physical Review Applied
  Abbreviation : Phys. Rev. Appl.
Source Genre: Journal
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Publ. Info: College Park, Md. [u.a.] : American Physical Society
Pages: - Volume / Issue: 16 (4) Sequence Number: 044014 Start / End Page: - Identifier: ISSN: 2331-7019
CoNE: https://pure.mpg.de/cone/journals/resource/2331-7019