Dynamical Defects in Rotating Magnetic Skyrmion Lattices
Dynamical Defects in Rotating Magnetic Skyrmion Lattices
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DOI：
10.1103/physrevlett.118.207205
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发表时间：
2017-05-19
影响因子：
8.6
通讯作者：
Back, C. H.
中科院分区：
文献类型：
--
作者：
Poellath, S.;Wild, J.;Back, C. H.
手性磁体Cu 2 OSeO 3拥有Skyrmion晶格，其可以等效地描述为平面波的叠加或粒子状拓扑对象的晶格。一个热梯度可能会打破Skyrmion晶格和诱导旋转域，提出了这些情况下更好地描述了暴力的动态域边界的问题。在这里，我们表明，在一个不均匀的温度梯度所造成的照明在洛伦兹透射电子显微镜的Skyrmion晶格的不同部分可以设置成运动具有不同的角速度。跟踪的时间依赖性，我们表明，畴壁的不断重排是由动态的5-7个缺陷排列成线。相关的缺陷密度的分析所描述的弗兰克方程，并同意与经典的2D蒙特卡罗模拟。边界的波动显示了Skyrmion集群的缺陷重排驱动的类似于一个类似于重排的模拟治疗Skyrmion作为点粒子。我们的发现强调了Skyrmion的粒子特征。
The chiral magnet Cu2OSeO3 hosts a Skyrmion lattice that may be equivalently described as a superposition of plane waves or a lattice of particlelike topological objects. A thermal gradient may break up the Skyrmion lattice and induce rotating domains, raising the question of which of these scenarios better describes the violent dynamics at the domain boundaries. Here, we show that in an inhomogeneous temperature gradient caused by illumination in a Lorentz transmission electron microscope different parts of the Skyrmion lattice can be set into motion with different angular velocities. Tracking the time dependence, we show that the constant rearrangement of domain walls is governed by dynamic 5-7 defects arranging into lines. An analysis of the associated defect density is described by Frank's equation and agrees well with classical 2D Monte Carlo simulations. Fluctuations of boundaries show a surgelike rearrangement of Skyrmion clusters driven by defect rearrangement consistent with simulations treating Skyrmions as point particles. Our findings underline the particle character of the Skyrmion.