用系统鞍点搜索方法揭示磁skyrmions的复制、坍缩和逃逸
Duplication, collapse and escape of magnetic skyrmions revealed using a systematic saddle point search method
摘要：
本文用一种沿能量面向上爬升并收敛到一阶鞍点的方法计算了磁skyrmion所能经历的各种跃迁。除了崩溃和逃逸通过边界，该方法确定了一个过渡的skyrmion分裂，形成两个skyrmion。这个复制过程的活化能可以类似于坍缩和逃逸的活化能。在动力学模拟中，发现外部磁场在一定时间间隔内的倾斜会引起复制过程。这样的过程可能会成为在未来的磁性设备中创造skyrmions的重要途径。
英文摘要：
Various transitions that a magnetic skyrmion can undergo are found in calculations using a method for climbing up the energy surface and converging onto first order saddle points. In addition to collapse and escape through a boundary, the method identifies a transition where the skyrmion divides and forms two skyrmions. The activation energy for this duplication process can be similar to that of collapse and escape. A tilting of the external magnetic field for a certain time interval is found to induce the duplication process in a dynamical simulation. Such a process could turn out to be an important avenue for the creation of skyrmions in future magnetic devices.
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