Research Abstract


Magnetic bilayer-skyrmions without skyrmion Hall effect

2016年1月19日 Nature Communications 7 : 10293 doi: 10.1038/ncomms10293



Xichao Zhang, Yan Zhou & Motohiko Ezawa

Corresponding Authors

江澤 雅彦
東京大学大学院 工学系研究科 物理工学専攻

Xichao Zhang
Yan Zhou

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.