Bilayer skyrmion dynamics on a magnetic anisotropy gradient
Magnetic skyrmion transport has been primarily based on the use of spin torques which require high current densities and face performance deterioration associated with Joule heating. In this work, we derive an analytical model for energy efficient skyrmion propagation in an antiferromagnetically-cou...
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sg-ntu-dr.10356-848972023-02-28T19:28:37Z Bilayer skyrmion dynamics on a magnetic anisotropy gradient Ang, Calvin Ching Ian Gan, Weiliang Lew, Wen Siang School of Physical and Mathematical Sciences Bilayer Skyrmions Skyrmion Transport Science::Physics Magnetic skyrmion transport has been primarily based on the use of spin torques which require high current densities and face performance deterioration associated with Joule heating. In this work, we derive an analytical model for energy efficient skyrmion propagation in an antiferromagnetically-coupled bilayer structure using a magnetic anisotropy gradient. The interlayer skyrmion coupling provides a strong restoring force between the skyrmions, which not only prevents annihilation but also increases their forward velocity up to the order of km s–1. For materials with low Gilbert damping parameter, the interlayer skyrmion coupling force can be amplified up to ten times, with a corresponding increase in velocity. Furthermore, the analytical model also provides insights into the dynamics of skyrmion pinning and relaxation of asymmetric skyrmion pairs in bilayer-coupled skyrmion systems. Published version 2019-07-05T08:44:19Z 2019-12-06T15:53:17Z 2019-07-05T08:44:19Z 2019-12-06T15:53:17Z 2019 Journal Article Ang, C. C. I., Gan, W., & Lew, W. S. (2019). Bilayer skyrmion dynamics on a magnetic anisotropy gradient. New Journal of Physics, 21(4), 043006-. doi:10.1088/1367-2630/ab1171 1367-2630 https://hdl.handle.net/10356/84897 http://hdl.handle.net/10220/49165 10.1088/1367-2630/ab1171 en New Journal of Physics © 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. 11 p. application/pdf |
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Bilayer Skyrmions Skyrmion Transport Science::Physics Ang, Calvin Ching Ian Gan, Weiliang Lew, Wen Siang Bilayer skyrmion dynamics on a magnetic anisotropy gradient |
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Magnetic skyrmion transport has been primarily based on the use of spin torques which require high current densities and face performance deterioration associated with Joule heating. In this work, we derive an analytical model for energy efficient skyrmion propagation in an antiferromagnetically-coupled bilayer structure using a magnetic anisotropy gradient. The interlayer skyrmion coupling provides a strong restoring force between the skyrmions, which not only prevents annihilation but also increases their forward velocity up to the order of km s–1. For materials with low Gilbert damping parameter, the interlayer skyrmion coupling force can be amplified up to ten times, with a corresponding increase in velocity. Furthermore, the analytical model also provides insights into the dynamics of skyrmion pinning and relaxation of asymmetric skyrmion pairs in bilayer-coupled skyrmion systems. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Ang, Calvin Ching Ian Gan, Weiliang Lew, Wen Siang |
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Article |
author |
Ang, Calvin Ching Ian Gan, Weiliang Lew, Wen Siang |
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Ang, Calvin Ching Ian |
title |
Bilayer skyrmion dynamics on a magnetic anisotropy gradient |
title_short |
Bilayer skyrmion dynamics on a magnetic anisotropy gradient |
title_full |
Bilayer skyrmion dynamics on a magnetic anisotropy gradient |
title_fullStr |
Bilayer skyrmion dynamics on a magnetic anisotropy gradient |
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Bilayer skyrmion dynamics on a magnetic anisotropy gradient |
title_sort |
bilayer skyrmion dynamics on a magnetic anisotropy gradient |
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2019 |
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https://hdl.handle.net/10356/84897 http://hdl.handle.net/10220/49165 |
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