3 years ago

Current-driven dynamics and inhibition of the skyrmion Hall effect of ferrimagnetic skyrmions in GdFeCo films.

Seonghoon Woo, Younghak Kim, Byoung-Chul Min, Dongjoon Lee, Seung-Young Park, Jun Woo Choi, Sang-Il Kim, Yan Zhou, Xiaoxi Liu, Hyun Cheol Koo, Nyun Jong Lee, Xichao Zhang, J. Raabe, S. Finizio, Joonyeon Chang, Motohiko Ezawa, OukJae Lee, Kyung Mee Song, Jae-Young Kim

Magnetic skyrmions are swirling magnetic textures with novel characteristics suitable for future spintronic and topological applications. Recent studies confirmed the room-temperature stabilization of skyrmions in ultrathin ferromagnets. However, such ferromagnetic skyrmions show undesirable topological effect, the skyrmion Hall effect, which leads to their current-driven motion towards device edges, where skyrmions could easily be annihilated by topographic defects. Recent theoretical studies have predicted enhanced current-driven behaviour for antiferromagnetically exchange-coupled skyrmions. Here we present the stabilization of these skyrmions and their current-driven dynamics in ferrimagnetic GdFeCo films. By utilizing element-specific X-ray imaging, we find that the skyrmions in the Gd and FeCo sublayers are antiferromagnetically exchange-coupled. We further confirm that ferrimagnetic skyrmions can move at a velocity of ~50 m s-1 with reduced skyrmion Hall angle, {\theta}SkHE ~20{\deg}. Our findings open the door to ferrimagnetic and antiferromagnetic skyrmionics while providing key experimental evidences of recent theoretical studies.

Publisher URL: http://arxiv.org/abs/1703.10310

DOI: arXiv:1703.10310v2

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