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

Authors
Woo, SeonghoonSong, Kyung MeeZhang, XichaoZhou, YanEzawa, MotohikoLiu, XiaoxiFinizio, S.Raabe, J.Lee, Nyun JongKim, Sang-IlPark, Seung-YoungKim, YounghakKim, Jae-YoungLee, DongjoonLee, OukJaeChoi, Jun WooMin, Byoung-ChulKoo, Hyun CheolChang, 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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