论文标题
野外驱动的天空运动通过天空和域墙之间的速度焦点运动
Field-driven skyrmion motion through velocity equipartition between skyrmions and a domain wall
论文作者
论文摘要
磁性天空作为具有轴对称性的旋转自旋纹理，无法通过均匀的磁场推动。因此，使用其他种类的刺激诱导了报道的天际动作。通常，磁性金属以及自旋波，热梯度和田间梯度的电流表现出它们驱动天空运动的能力。在这里，我们通过微磁模拟并在分析上证明了磁空可以通过域壁（DW）介体通过均匀的垂直磁场来取代。对于固定的场强，Skyrmion列车的速度以1 /（1 + ns）表示，NS表示天空的数量。基于Thiele的模型，我们首先从数值结果中鉴定出速度-NS关系，并表明Skyrmion-DW和Skyrmion Inter-Skyrmion copulsions为Skyrmion运动提供了直接的驱动力。这项研究强调了自旋纹理在天际动力学中的相互作用的作用，并为与绝缘磁体特别相关的天空操作打开了另一种途径。鉴于磁性和电力之间的对应关系，我们预计该方案也应适用于铁电的极性天空。
Magnetic skyrmions, as a whirling spin texture with axisymmetry, cannot be propelled by a uniform magnetic field. Therefore, reported skyrmion motions have been induced using other sorts of stimuli; typically, electric currents in magnetic metals as well as spin waves, thermal gradient, and field gradient have manifested their ability to drive skyrmion motion. Here, we demonstrate, through micromagnetic simulations and analytically, that magnetic skyrmions can be displaced by a uniform perpendicular magnetic field via a domain-wall (DW) mediator. For a fixed field strength, the velocity of a skyrmion train evolves in terms of 1 / (1 + Ns) with Ns denoting the number of skyrmions. Based on Thiele's model, we reproduce the velocity-Ns relation first identified from numerical results and reveal that the skyrmion-DW and inter-skyrmion repulsions offer the direct driving force for skyrmion motion. This study underlines the role of spin textures' interaction in skyrmion dynamics, and opens an alternative route for skyrmion manipulation especially relevant to insulating magnets. Given the correspondence between magnetism and electricity, we anticipate that the scheme should also work for polar skyrmions in ferroelectrics.
