标题： 磁反涡旋的超快动力学 - 微磁模拟 显示英文标题

标题： Ultrafast dynamics of a magnetic antivortex - Micromagnetic simulations

摘要： 反涡旋是一种基本的磁化结构，是众所周知的磁涡旋的拓扑对应物。 我们在此研究了在图案化坡莫合金薄膜元件中孤立反涡旋的超快动态行为。 通过微磁学模拟，我们预测反涡旋对超短外部场脉冲的响应特征是产生一个新的反涡旋以及一个临时涡旋，随后发生湮灭过程。 这些过程与最近报道的涡旋响应相辅相成，并且像涡旋一样，导致反涡旋核心区域取向的反转。 除了其基本兴趣外，这种动态磁化过程可用于生成和传播自旋波，以实现新型逻辑电路。 显示英文摘要

摘要： The antivortex is a fundamental magnetization structure which is the topological counterpart of the well-known magnetic vortex. We study here the ultrafast dynamic behavior of an isolated antivortex in a patterned Permalloy thin-film element. Using micromagnetic simulations we predict that the antivortex response to an ultrashort external field pulse is characterized by the production of a new antivortex as well as of a temporary vortex, followed by an annihilation process. These processes are complementary to the recently reported response of a vortex and, like for the vortex, lead to the reversal of the orientation of the antivortex core region. In addition to its fundamental interest, this dynamic magnetization process could be used for the generation and propagation of spin waves for novel logical circuits.