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arXiv · 1505.03972

Electric-field guiding of magnetic skyrmions

Pramey Upadhyaya·Guoqiang Yu·Pedram Khalili Amiri·Kang L. Wang
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Abstract

We theoretically study equilibrium and dynamic properties of nanosized magnetic skyrmions in thin magnetic films with broken inversion symmetry, where electric field couples to magnetization via spin-orbit coupling. Based on a symmetry-based phenomenology and micromagnetic simulations we show that this electric-field coupling, via renormalizing the micromagnetic energy, modifies the equilibrium properties of the skyrmion. This change, in turn, results in a significant alteration of the current-induced skyrmion motion. Particularly, speed and direction of the skyrmion can be manipulated by designing a desired energy landscape electrically, which we describe within Thiele's analytical model and demonstrate in micromagnetic simulations including electric-field-controlled magnetic anisotropy. We additionally use this electric-field control to construct gates for controlling skyrmion motion exhibiting a transistor-like and multiplexer-like function. The proposed electric-field effect can thus provide a low energy electrical knob to extend the reach of information processing with skyrmions.

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Pramey Upadhyaya, Guoqiang Yu, Pedram Khalili Amiri, Kang L. Wang. 2015-05-15. Electric-field guiding of magnetic skyrmions. https://doi.org/10.1103/physrevb.92.134411

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