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Magnetic bilayer-skyrmions without skyrmion Hall effect
#MMPMID26782905
Zhang X
; Zhou Y
; Ezawa M
Nat Commun
2016[Jan]; 7
(?): 10293
PMID26782905
show ga
Magnetic skyrmions might be used as information carriers in future advanced
memories, logic gates and computing devices. However, there exists an obstacle
known as the skyrmion Hall effect (SkHE), that is, the skyrmion trajectories bend
away from the driving current direction due to the Magnus force. Consequently,
the skyrmions in constricted geometries may be destroyed by touching the sample
edges. Here we theoretically propose that the SkHE can be suppressed in the
antiferromagnetically exchange-coupled bilayer system, since the Magnus forces in
the top and bottom layers are exactly cancelled. We show that such a pair of
SkHE-free magnetic skyrmions can be nucleated and be driven by the
current-induced torque. Our proposal provides a promising means to move magnetic
skyrmions in a perfectly straight trajectory in ultra-dense devices with
ultra-fast processing speed.
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