Formation and current-induced motion of synthetic antiferromagnetic skyrmion bubbles

Takaaki Dohi, Samik DuttaGupta, Shunsuke Fukami () and Hideo Ohno
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Takaaki Dohi: Tohoku University
Samik DuttaGupta: Tohoku University
Shunsuke Fukami: Tohoku University
Hideo Ohno: Tohoku University

Nature Communications, 2019, vol. 10, issue 1, 1-6

Abstract: Abstract Skyrmion, a topologically-protected soliton, is known to emerge via electron spin in various magnetic materials. The magnetic skyrmion can be driven by low current density and has a potential to be stabilized in nanoscale, offering new directions of spintronics. However, there remain some fundamental issues in widely-studied ferromagnetic systems, which include a difficulty to realize stable ultrasmall skyrmions at room temperature, presence of the skyrmion Hall effect, and limitation of velocity owing to the topological charge. Here we show skyrmion bubbles in a synthetic antiferromagnetic coupled multilayer that are free from the above issues. Additive Dzyaloshinskii-Moriya interaction and spin-orbit torque (SOT) of the tailored stack allow stable skyrmion bubbles at room temperature, significantly smaller threshold current density or higher speed for motion, and negligible skyrmion Hall effect, with a potential to be scaled down to nanometer dimensions. The results offer a promising pathway toward nanoscale and energy-efficient skyrmion-based devices.

Date: 2019
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DOI: 10.1038/s41467-019-13182-6

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