论文标题
具有方位域的磁性纳米管中电流诱导的域壁运动的理论研究，包括– rsted场和自旋转移扭矩
Theoretical study of current-induced domain wall motion in magnetic nanotubes with azimuthal domains, including Œrsted field and spin-transfer torques
论文作者
论文摘要
我们报告了无限长的纳米管中电流下磁性域壁行为的理论概述，并结合了$ 1 $ d的分析模型和微磁模拟。我们强调的是，除了在扁平条中已经很大程度上理解的自旋转移扭矩外，特别是在管状几何形状中出现的：\ oersted场和曲率诱导的磁各向异性均来自交换和材料生长。根据管子的几何形状和方位角各向异性的强度，Bloch或Néel壁均出现，在静止时出现，导致两个运动方式在很大程度上由自旋转移扭矩或\ oersted场占主导地位。在所有情况下，我们都会确定沃克分解电流，并突出显示最合适的参数，以达到高域壁速。
We report a theoretical overview of the magnetic domain wall behavior under an electric current in infinitely-long nanotubes with azimuthal magnetization, combining the $1$D analytic model and micromagnetic simulations. We highlight effects that, besides spin-transfer torques already largely understood in flat strips, arise specifically in the tubular geometry: the \OErsted field and curvature-induced magnetic anisotropy resulting both from exchange and material growth. Depending on both the geometry of the tube and the strength of the azimuthal anisotropy, Bloch or Néel walls arise at rest, resulting in two regimes of motion largely dominated by either spin-transfer torques or the \OErsted field. We determine the Walker breakdown current in all cases, and highlight the most suitable parameters to achieve high domain wall speed.
