论文标题
在厚铁磁纳米风险的扭曲旋转波的本征模
Eigenmodes of twisted spin-waves in a thick ferromagnetic nanodisk
论文作者
论文摘要
磁性涡流在拓扑上是不平凡的，通常在铁磁纳米虫中发现。到目前为止，已经在铁电磁纳米虫中鉴定出三类自旋特征模式，即旋转，方位角和径向模式。在这里，使用微磁模拟和分析计算，我们揭示了厚薄的绒毛（Ni0.8Fe0.2）纳米台面中的扭曲的自旋波模式。扭曲的自旋波携带拓扑电荷，这符号取决于纳米磁管中磁性涡流的核心极性。通过在样品的一端施加旋转磁场，我们观察到具有具有特征性螺旋相的扭曲自旋波的连续产生，并携带拓扑电荷L = 1，-1、2和-2。扭曲自旋波的分散关系是通过分析得出的，其结果与微磁性数值计算非常吻合。
Magnetic vortex is topologically nontrivial and commonly found in ferromagnetic nanodisks. So far, three classes spin-wave eigenmodes, i.e., gyrotropic, azimuthal and radial modes, have been identified in ferromagnetic nanodisks. Here, using micromagnetic simulation and analytical calculation, we reveal twisted spin-wave modes in a thick permalloy (Ni0.8Fe0.2) nanodisk. The twisted spin-waves carry topological charges, which sign depends on the core polarity of the magnetic vortex in the nanodisk. By applying rotating magnetic fields at one end of the sample, we observe continuous generation of twisted spin-waves that have characteristic spiral phase front and carry topological charge l = 1, -1, 2 and -2. The dispersion relation of twisted spin-waves is derived analytically and the result is in good agreement with micromagnetic numerical calculations.
