Skyrmion size and density in lattices

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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2023-12-22

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Department of Applied Physics

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en

Pages

7

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Journal of Applied Physics, Volume 134, issue 24, pp. 1-7

Abstract

The effect of changing magnetic parameters on the size and density of skyrmions in a hexagonal lattice is investigated using micromagnetic simulations. Achieving control of the skyrmion density, for instance, by applied voltages, is a route to magnetic neuromorphic computing devices. Here, we show how small changes in the uniaxial magnetic anisotropy and Dzyaloshinskii-Moriya interaction lead to large changes in the skyrmion size and density, which occurs for parameters that do not support isolated skyrmions. The effect of a grain structure on the density of skyrmions is modeled through the introduction of a locally varying anisotropy. This shows that a higher density of skyrmions is favored for a wider distribution of magnetic anisotropy. The results provide a clear understanding of systems where the skyrmion density can be externally controlled and assist the design of functional skyrmion-based devices.

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Funding Information: This work was supported by the Academy of Finland (Grant No. 316857). Computational resources were provided by the Aalto Science-IT project. Publisher Copyright: © 2023 Author(s).

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DOI

10.1063/5.0181599

Citation

Mansell, R, Huhtasalo, J, Ameziane, M & van Dijken, S 2023, ' Skyrmion size and density in lattices ', Journal of Applied Physics, vol. 134, no. 24, 243901, pp. 1-7 . https://doi.org/10.1063/5.0181599

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https://urn.fi/URN:NBN:fi:aalto-202401171440

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[article-cris] Perustieteiden korkeakoulu / SCI