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Efficient skyrmion transport mediated by a voltage controlled magnetic anisotropy gradient

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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.

Graphical abstract: Efficient skyrmion transport mediated by a voltage controlled magnetic anisotropy gradient

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Publication details

The article was received on 31 Aug 2017, accepted on 29 Nov 2017 and first published on 01 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR06482A
Citation: Nanoscale, 2018, Advance Article
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    Efficient skyrmion transport mediated by a voltage controlled magnetic anisotropy gradient

    X. Wang, W. L. Gan, J. C. Martinez, F. N. Tan, M. B. A. Jalil and W. S. Lew, Nanoscale, 2018, Advance Article , DOI: 10.1039/C7NR06482A

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