论文标题
超出铁磁GDCO薄膜固定的天空的尺寸依赖性迁移率
Size-dependent mobility of skyrmions beyond pinning in ferrimagnetic GdCo thin films
论文作者
论文摘要
磁性天空是旋转的磁纹理，可以通过具有偏转轨迹的自旋轨道扭矩有效地驱动。然而，固定降低了天空的降低并改变了它们的轨迹，从而阻止了与分析模型的定量比较。在这里，我们研究了在室温下在铁磁性GDCO薄膜的旋转轨道上驱动的天际，这是一种无定形的材料，固定较低。在尖锐的电流延伸阈值之上，我们观察到明显的线性速度随电流的速度增加，而电流可外推到零且恒定偏转角，达到高达200 m/s的高速度。迁移率增加，而含阈值电流随着天空直径的减小，我们使用外部磁场变化。基于Thiele方程的分析模型通过单个拟合参数定量地重现了这些发现。这验证了线性流动制度描述，并特别显示了天际大小在动态中的重要作用。
Magnetic skyrmions are swirling magnetic textures that can be efficiently driven with spin-orbit torques with a deflected trajectory. However, pinning slows skyrmions down and alters their trajectory, which prevents a quantitative comparison to analytical models. Here, we study skyrmions driven by spin-orbit torques at room temperature in ferrimagnetic GdCo thin films, an amorphous material with low pinning. Above a sharp current depinning threshold, we observe a clearly linear velocity increase with current that extrapolates to zero and a constant deflection angle, reaching high velocities up to 200 m/s. The mobility increases and the depinning threshold current decreases with the skyrmion diameter, which we vary using an external magnetic field. An analytical model based on the Thiele equation quantitatively reproduces these findings with a single fitting parameter. This validates the linear flow regime description and shows, in particular, the important role of skyrmion size in its dynamics.
