论文标题
手性磁性层中额外的界面自旋转移扭矩的作用
Role of an additional interfacial spin-transfer torque for current-driven skyrmion dynamics in chiral magnetic layers
论文作者
论文摘要
由于旋转大厅的效果，可以通过自旋轨道扭矩驱动天空。在这里，我们对超薄多层的额外贡献进行了建模，这是由于重金属 /铁磁界面的自旋积累而产生的，并观察到对各种Skyrmion直径的影响。界面自旋转移扭矩和自旋轨道扭矩的组合导致了天际运动，这有助于解释对小于100 nm的天空直径的小天空厅角的观察。我们表明，这个额外的术语对天际动力学有显着影响，并导致小天空直径的天空厅角迅速降低，以及Skyrmion Hall角度与天际速度依赖性几乎独立于表面粗糙度特征。同样，各种无序能量景观的影响，以表面粗糙度的形式，对天堂厅的角度和速度的影响很大程度上取决于驱动依赖性。我们的结果表明，与实验中发现的结果非常吻合，因此得出的结论是，界面自旋转移扭矩应包括在微电磁模拟中以复制实验结果。
Skyrmions can be driven by spin-orbit torques as a result of the spin Hall effect. Here we model an additional contribution in ultra-thin multilayers, arising from the spin accumulation at heavy metal / ferromagnetic interfaces and observe the effects on a large range of skyrmion diameters. The combination of the interfacial spin-transfer torque and the spin-orbit torque results in skyrmion motion which helps to explain the observation of small skyrmion Hall angles for skyrmion diameters less than 100 nm. We show that this additional term has a significant effect on the skyrmion dynamics and leads to rapidly decreasing skyrmion Hall angles for small skyrmion diameters, as well as a skyrmion Hall angle versus skyrmion velocity dependence nearly independent of the surface roughness characteristics. Also, the effect of various disordered energy landscapes, in the form of surface roughness, on the skyrmion Hall angle and velocity is shown to be largely drive-dependent. Our results show good agreement with those found in experiments thus concluding that the interfacial spin-transfer torque should be included in micromagnetics simulations for the reproduction of experimental results.
