Current-driven dynamics and inhibition of the skyrmion Hall effect of ferrimagnetic skyrmions in GdFeCo films
- Authors
- Woo, Seonghoon; Song, Kyung Mee; Zhang, Xichao; Zhou, Yan; Ezawa, Motohiko; Liu, Xiaoxi; Finizio, S.; Raabe, J.; Lee, Nyun Jong; Kim, Sang-Il; Park, Seung-Young; Kim, Younghak; Kim, Jae-Young; Lee, Dongjoon; Lee, OukJae; Choi, Jun Woo; Min, Byoung-Chul; Koo, Hyun Cheol; Chang, Joonyeon
- Issue Date
- 2018-03
- Publisher
- Nature Publishing Group
- Citation
- Nature Communications, v.9
- 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 similar to 50 m s(-1) with reduced skyrmion Hall angle, |theta(SkHE)| similar to 20 degrees. Our findings open the door to ferrimagnetic and antiferromagnetic skyrmionics while providing key experimental evidences of recent theoretical studies.
- Keywords
- MAGNETIC SKYRMIONS; Spintronics; Magnetic Skyrmion; Ferrimagnetism
- ISSN
- 2041-1723
- URI
- https://pubs.kist.re.kr/handle/201004/121655
- DOI
- 10.1038/s41467-018-03378-7
- Appears in Collections:
- KIST Article > 2018
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