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

Seonghoon Woo (), Kyung Mee Song, Xichao Zhang, Yan Zhou, Motohiko Ezawa, Xiaoxi Liu, S. Finizio, J. Raabe, Nyun Jong Lee, Sang-Il Kim, Seung-Young Park, Younghak Kim, Jae-Young Kim, Dongjoon Lee, OukJae Lee, Jun Woo Choi, Byoung-Chul Min, Hyun Cheol Koo and Joonyeon Chang
Additional contact information
Seonghoon Woo: Korea Institute of Science and Technology
Kyung Mee Song: Korea Institute of Science and Technology
Xichao Zhang: The Chinese University of Hong Kong
Yan Zhou: The Chinese University of Hong Kong
Motohiko Ezawa: University of Tokyo
Xiaoxi Liu: Shinshu University
S. Finizio: Paul Scherrer Institut
J. Raabe: Paul Scherrer Institut
Nyun Jong Lee: Division of Scientific Instrumentation, Korea Basic Science Institute
Sang-Il Kim: Division of Scientific Instrumentation, Korea Basic Science Institute
Seung-Young Park: Division of Scientific Instrumentation, Korea Basic Science Institute
Younghak Kim: Pohang University of Science and Technology
Jae-Young Kim: Pohang University of Science and Technology
Dongjoon Lee: Korea Institute of Science and Technology
OukJae Lee: Korea Institute of Science and Technology
Jun Woo Choi: Korea Institute of Science and Technology
Byoung-Chul Min: Korea Institute of Science and Technology
Hyun Cheol Koo: Korea Institute of Science and Technology
Joonyeon Chang: Korea Institute of Science and Technology

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract 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 an 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 behavior 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, |θSkHE| ~ 20°. Our findings open the door to ferrimagnetic and antiferromagnetic skyrmionics while providing key experimental evidences of recent theoretical studies.

Date: 2018
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DOI: 10.1038/s41467-018-03378-7

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