Abstract Magnetic skyrmions are intriguing topological spin textures that promise future high-density spintronic devices. The creation of magnetic skyrmions has been understood based on the energetics of skyrmions, but the detailed dynamic process of the skyrmion creation remains unclear. Here topological evolution in conversion from uneven domains to Neel-skyrmions is investigated using micromagnetic simulations. We find that, rather than the overall topological charge, annihilation of novel topological defects, i.e., recently suggested domain wall skyrmions, dominantly govern the skyrmion creation process. Also, the topological charge evolution is interpreted in terms of the number and the combination of such topological defects.

中文翻译：

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向 Néel 型斯格明子过渡的动态过程的拓扑电荷分析：畴壁斯格明子的作用

摘要 磁性斯格明子是一种有趣的拓扑自旋纹理，有望成为未来的高密度自旋电子器件。已经根据斯格明子的能量学了解了磁性斯格明子的产生，但斯格明子产生的详细动态过程仍不清楚。这里使用微磁模拟研究了从不均匀域到 Neel-skyrmions 转换的拓扑演变。我们发现，不是整体拓扑电荷，新拓扑缺陷的湮灭，即最近提出的畴壁斯格明子，主导了斯格明子的产生过程。此外，拓扑电荷演化是根据这种拓扑缺陷的数量和组合来解释的。