Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/84897
Title: Bilayer skyrmion dynamics on a magnetic anisotropy gradient
Authors: Ang, Calvin Ching Ian
Gan, Weiliang
Lew, Wen Siang
Keywords: Bilayer Skyrmions
Skyrmion Transport
Science::Physics
Issue Date: 2019
Source: 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
Series/Report no.: New Journal of Physics
Abstract: 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.
URI: https://hdl.handle.net/10356/84897
http://hdl.handle.net/10220/49165
ISSN: 1367-2630
DOI: http://dx.doi.org/10.1088/1367-2630/ab1171
Rights: © 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.
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