坡莫合金薄膜中拓扑缺陷的粗化动力学
Coarsening dynamics of topological defects in thin Permalloy films
摘要：
本文研究了矩形坡莫合金薄膜单元在随机磁化初始状态弛豫过程中磁织构中拓扑缺陷的动力学行为。我们的完整的微磁模拟揭示了复杂的缺陷动力学松弛过程中的稳定的朗道封闭域模式，表现为时间的幂律衰减，与系统大小相关的截止时间，各种数量。这些包括系统的能量密度，以及系统中存在的不同种类的拓扑缺陷的数密度。相关的幂律指数假设非平凡的值，并被发现是不同的不同的缺陷类型。的指数是稳健的，对适度增加的吉尔伯特阻尼常数和淬火结构无序的介绍。我们讨论的细节的过程中所允许的保存的绕组数量的缺陷，其复杂的粗化动力学的基础。
英文摘要：
We study the dynamics of topological defects in the magnetic texture of rectangular Permalloy thin film elements during relaxation from random magnetization initial states. Our full micromagnetic simulations reveal complex defect dynamics during relaxation towards the stable Landau closure domain pattern, manifested as temporal power-law decay, with a system-size dependent cut-off time, of various quantities. These include the energy density of the system, and the number densities of the different kinds of topological defects present in the system. The related power-law exponents assume non-trivial values, and are found to be different for the different defect types. The exponents are robust against a moderate increase in the Gilbert damping constant and introduction of quenched structural disorder. We discuss details of the processes allowed by conservation of the winding number of the defects, underlying their complex coarsening dynamics.
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