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Topological defect-mediated skyrmion annihilation in three dimensions
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Birch, Max T., Cortés-Ortuño, David, Khanh, Nguyen D., Seki, Shinichiro, Štefančič, Aleš, Balakrishnan, Geetha, Tokura, Yoshinori and Hatton, Peter D. (2021) Topological defect-mediated skyrmion annihilation in three dimensions. Communications Physics, 4 (1). 175. doi:10.1038/s42005-021-00675-4 ISSN 2399-3650.
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Official URL: http://dx.doi.org/10.1038/s42005-021-00675-4
Abstract
The creation and annihilation of magnetic skyrmions are mediated by three-dimensional topological defects known as Bloch points. Investigation of such dynamical processes is important both for understanding the emergence of exotic topological spin textures, and for future engineering of skyrmions in technological applications. However, while the annihilation of skyrmions has been extensively investigated in two dimensions, in three dimensions the phase transitions are considerably more complex. We report field-dependent experimental measurements of metastable skyrmion lifetimes in an archetypal chiral magnet, revealing two distinct regimes. Comparison to supporting three-dimensional geodesic nudged elastic band simulations indicates that these correspond to skyrmion annihilation into either the helical and conical states, each exhibiting a different transition mechanism. The results highlight that the lowest energy magnetic configuration of the system plays a crucial role when considering the emergence and stability of topological spin structures via defect-mediated dynamics.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QC Physics | |||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Skyrme model, Magnetic materials, Phase transformations (Statistical physics) , Chirality , Topological defects (Physics) | |||||||||
| Journal or Publication Title: | Communications Physics | |||||||||
| Publisher: | Springer Nature Ltd | |||||||||
| ISSN: | 2399-3650 | |||||||||
| Official Date: | 5 August 2021 | |||||||||
| Dates: |
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| Volume: | 4 | |||||||||
| Number: | 1 | |||||||||
| Article Number: | 175 | |||||||||
| DOI: | 10.1038/s42005-021-00675-4 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||
| Copyright Holders: | The Authors | |||||||||
| Date of first compliant deposit: | 12 August 2021 | |||||||||
| Date of first compliant Open Access: | 13 August 2021 | |||||||||
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