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Title: Efficient skyrmion transport mediated by a voltage controlled magnetic anisotropy gradient
Authors: Wang, Xuan
Gan, Wei Liang
Martinez, J. C.
Tan, Fu Nan
Jalil, M. B. A.
Lew, Wen Siang
Keywords: Science::Physics
Issue Date: 2017
Source: Wang, X., Gan, W. L., Martinez, J. C., Tan, F. N., Jalil, M. B. A., & Lew, W. S. (2018). Efficient skyrmion transport mediated by a voltage controlled magnetic anisotropy gradient. Nanoscale, 10(2), 733-740. doi:10.1039/c7nr06482a
Journal: Nanoscale
Abstract: Despite the inefficiencies associated with current-induced spin torques, they remain the predominant mode of skyrmion propulsion. In this work, we demonstrate numerically that skyrmions can be transported much more efficiently with a voltage-controlled magnetic anisotropy (VCMA) gradient. An analytical model was developed to understand the underlying skyrmion dynamics on a track under the VCMA conditions. Our calculations reveal that the repulsive skyrmion-edge interaction not only prevents the skyrmion from annihilating but also generates most of the skyrmion propulsion. A multiplexed array of gate electrodes can be used to create discrete anisotropy gradients over a long distance, leading to the formation of a series of translatable skyrmion potential wells. Due to the strong confining potentials, skyrmions are transported at a 70% higher packing density. Finally, we demonstrated that this form of skyrmion propulsion can also be implemented on almost any 2D geometry, providing improved versatility over current-induced methods.
ISSN: 2040-3364
DOI: 10.1039/c7nr06482a
Rights: © 2018 The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles


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