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  Coarse-graining collective skyrmion dynamics in confined geometries

Winkler, T. B., Rothörl, J., Brems, M. A., Beneke, G., Fangohr, H., & Kläui, M. (2024). Coarse-graining collective skyrmion dynamics in confined geometries. Applied Physics Letters, 124(2): 022403. doi:10.1063/5.0187446.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000C-DD19-0 Version Permalink: https://hdl.handle.net/21.11116/0000-000E-363E-1
Genre: Journal Article

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https://arxiv.org/abs/2303.16472 (Preprint)
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 Creators:
Winkler, T. B.1, Author
Rothörl, J.1, Author
Brems, M. A.1, Author
Beneke, G.1, Author
Fangohr, H.2, 3, Author           
Kläui, M.1, Author
Affiliations:
1Institute of Physics, Johannes Gutenberg University, ou_persistent22              
2Faculty of Engineering and Physical Sciences, University of Southampton, ou_persistent22              
3Computational Science, Scientific Service Units, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3267028              

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 Abstract: Magnetic skyrmions are magnetic quasi-particles with enhanced stability and different manipulation mechanisms using external fields and currents, making them promising candidates for future applications such as neuromorphic computing. Recently, several measurements and simulations have shown that thermally activated skyrmions in confined geometries, as they are necessary for device applications, arrange themselves predominantly based on commensurability effects. In this simulational study, based on the Thiele model, we investigate the enhanced dynamics and degenerate non-equilibrium steady state of a system in which the intrinsic skyrmion–skyrmion and skyrmion–boundary interaction compete with thermal fluctuations as well as current-induced spin–orbit torques. The investigated system is a triangular-shaped confinement geometry hosting four skyrmions, where we inject spin-polarized currents between two corners of the structure. We coarse grain the skyrmion states in the system to analyze the intricacies of arrangements of the skyrmion ensemble. In the context of neuromorphic computing, such methods address the key challenge of optimizing readout positions in confined geometries and form the basis for understanding collective skyrmion dynamics in systems with competing interactions on different scales. The findings are corroborated by experimental measurements.

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Language(s): eng - English
 Dates: 2023-11-142023-12-122024-01-092024-01-08
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2303.16472
DOI: 10.1063/5.0187446
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Grant ID : 856538
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
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Grant ID : 101070290
Funding program : Horizon Europe (HE)
Funding organization : European Commission (EC)
Project name : The authors acknowledge funding from the emergentAI center, funded by the Carl Zeiss Stiftung, as well as by the German Research Foundation (DFG SFB TRR 173, SPIN+X, A01 - 268565370, and B12 - 268565370) and project 403502522 SPP 2137 as well as TopDyn. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme under grant agreement No. 856538 (ERC-SyG 3D MAGIC). The project further acknowledges funding by EU HORIZON-CL4-2021-DIGITAL-EMERGING-01-14 programme under grant agreement No. 101070290 (NIMFEIA). M.B. is supported by a doctoral scholarship from the Studienstiftung des deutschen Volkes. We thank Peter Virnau for valuable discussions.
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Title: Applied Physics Letters
  Abbreviation : Appl. Phys. Lett.
Source Genre: Journal
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Publ. Info: Melville, NY : American Institute of Physics
Pages: - Volume / Issue: 124 (2) Sequence Number: 022403 Start / End Page: - Identifier: ISSN: 0003-6951
CoNE: https://pure.mpg.de/cone/journals/resource/954922836223