论文标题
杂质簇在电流驱动的磁空运动中的作用
Role of impurity clusters for the current-driven motion of magnetic Skyrmions
论文作者
论文摘要
我们研究杂质如何影响赛道几何形状中移动的磁空动力学的电流诱导的动力学。为此，我们在数值上求解了通过电流诱导的自旋转移扭矩扩展的广义landau-lifshitz-gilbert方程。特别是，我们研究了两类杂质，非导导和磁杂质。前者是磁性刚性物体，并在赛道上屈服于不均匀的电流密度，我们通过求解基本的静电方程来分别确定。相比之下，磁杂质使整个条带的施加的电流密度均匀。根据参数，我们观察到存在疾病，天空衰减，固定，额外的天空和普通的Skyrmion段落的四种不同情况。我们计算和讨论杂质的杂质浓度和半径的相图。
We study how impurities influence the current-induced dynamics of magnetic Skyrmions moving in a racetrack geometry. For this, we solve numerically the generalized Landau-Lifshitz-Gilbert equation extended by the current-induced spin transfer torque. In particular, we investigate two classes of impurities, non-conducting and magnetic impurities. The former are magnetically rigid objects and yield to an inhomogeneous current density over the racetrack which we determine separately by solving the fundamental electrostatic equations. In contrast, magnetic impurities leave the applied current density homogeneous throughout the stripe. Depending on parameters, we observe four different scenarios of Skyrmion motions in the presence of disorder, the Skyrmion decay, the pinning, the creation of additional Skyrmions, and ordinary Skyrmion passage. We calculate and discuss phase diagrams in dependence of the impurity concentration and radii of the impurities.
