Dynamical switching of confined magnetic skyrmions under circular magnetic fields
Dynamical switching of confined magnetic skyrmions under circular magnetic fields
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DOI：
10.1103/physrevb.101.024409
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发表时间：
2020-01
影响因子：
3.7
通讯作者：
S. Abdizadeh;J. Abouie;K. Zakeri
中科院分区：
文献类型：
--
作者：
S. Abdizadeh;J. Abouie;K. Zakeri
了解磁Skyrmion的动力学性质对于实现Skyrmion基器件至关重要。在这里，我们报告的动力学约束下的圆形磁场（CMFs）的磁skyrmion的应用。我们给出了动力学态的复映射，并证明了在一定条件下，CMFs可以改变Skyrmion数，导致核极性的转换。结合微磁学模拟和解析计算的结果，基于扩展的Thiele方程，我们揭示了这种动力学开关背后的物理机制。核心开关与由CMF驱动的Skyrmion的动力学运动相关联。畴壁的形成和它们从边界向中心的移动导致了skyrmion的收缩和具有相反核心极性的skyrmion的产生。这一结果为检验skyrmion的稳定性提供了指导，同时也为利用CMF实现核极性切换提供了一种有效的方法。
Understanding the dynamical properties of magnetic skyrmions is of prime importance for realization of skyrmion based devices. Here we report on the dynamics of a confined magnetic skyrmion under application of circular magnetic fields (CMFs). We provide the complex map of the dynamical states and demonstrate that under some conditions CMFs can change the skyrmion number and lead to the switching of the core polarity. Combing the results of micromagnetic simulations with those of analytical calculations, based on the extended Thiele equation, we unravel the physical mechanism behind this dynamical switching. The core switching is associated with the dynamical motions of the skyrmion driven by a CMF. The formation of domain walls and their movement from the border towards the center leads to shrinking of the skyrmion and the creation of a skyrmion with opposite core polarity. The results provide a guideline for checking the skyrmion's stability as well as an efficient way for switching the core polarity using CMFs.