Skyrmion_Brownian_Motion_in_a_granular_film_Highlighted_270721.pdf (1.41 MB)
Thermal motion of skyrmion arrays in granular films
journal contribution
posted on 2022-05-09, 13:23 authored by Yifan Zhou, Rhodri Mansell, Tapio Ala-NissilaTapio Ala-Nissila, Sebastiaan van DijkenMagnetic skyrmions are topologically distinct swirls of magnetic moments which display particlelike behavior, including the ability to undergo thermally driven diffusion. In this paper we study the thermally activated motion of arrays of skyrmions using temperature dependent micromagnetic simulations where the skyrmions form spontaneously. In particular, we study the interaction of skyrmions with grain boundaries, which are a typical feature of sputtered ultrathin films used in experimental devices. We find the interactions lead to two distinct regimes. For longer lag times the grains lead to a reduction in the diffusion coefficient, which is strongest for grain sizes similar to the skyrmion diameter. At shorter lag times the presence of grains enhances the effective diffusion coefficient due to the gyrotropic motion of the skyrmions induced by their interactions with grain boundaries. For grain sizes significantly larger than the skyrmion diameter clustering of the skyrmions occurs in grains with lower magnetic anisotropy.
Funding
Academy of Finland (Grants No. 295269, No. 306978, and No. 327804)
Academy of Finland Centre of Excellence program Quantum Technology Finland (project 312298)
History
School
- Science
Department
- Mathematical Sciences
Published in
Physical Review BVolume
104Issue
14Publisher
American Physical Society (APS)Version
- AM (Accepted Manuscript)
Rights holder
© American Physical SocietyPublisher statement
This paper was accepted for publication in the journal Physical Review B and the definitive published version is available at https://doi.org/10.1103/physrevb.104.144417Acceptance date
2021-10-05Publication date
2021-10-21Copyright date
2021ISSN
2469-9950eISSN
2469-9969Publisher version
Language
- en
Depositor
Prof Tapio Ala-Nissila. Deposit date: 5 May 2022Article number
144417Usage metrics
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