Magnetic bilayer-skyrmions without skyrmion Hall effect.
Magnetic bilayer-skyrmions without skyrmion Hall effect.
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DOI：
10.1038/ncomms10293
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发表时间：
2016-01-19
影响因子：
16.6
通讯作者：
Ezawa M
中科院分区：
文献类型：
--
作者：
Zhang X;Zhou Y;Ezawa M
磁性斯格明子可能被用作未来先进存储器、逻辑门和计算设备中的信息载体。然而，存在一个被称为斯格明子霍尔效应（SkHE）的障碍，即斯格明子轨迹由于马格努斯力而偏离驱动电流方向。因此，收缩几何形状的斯格明子可能会因接触样品边缘而被破坏。在这里，我们从理论上提出，由于顶层和底层的马格努斯力完全抵消，SkHE 可以在反铁磁交换耦合双层系统中被抑制。我们证明这样一对无 SkHE 的磁性斯格明子可以成核并由电流感应扭矩驱动。我们的建议提供了一种有前途的方法，可以在超密集设备中以超快的处理速度以完美的直线轨迹移动磁性斯格明子。 在施加电流下沿纳米线传播的磁性斯格明子会受到马格努斯力的作用，使它们偏向可能被破坏的边缘，从而可能阻碍其应用。在这里，作者提出了一种利用磁性双层系统来解决这个问题的方法。
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. Magnetic skyrmions propagating under an applied current along a nanowire experience the magnus force, deflecting them towards the edges where they may be destroyed, potentially hindering their applications. Here, the authors propose a method to surpass this issue utilizing magnetic bilayers systems.