AI 中文总结
研究铁磁薄膜中条纹纹理的磁振子晶体特性，采用微磁模拟计算模型铁石榴石薄膜自旋波谱，重点关注外场和立方各向异性影响，发现不同位置带隙对外加场响应不同，垂直磁场或立方各向异性存在时中间会出现额外带隙。
AI 中文摘要
铁磁薄膜中的有序条纹畴形成了用于传播自旋波的天然一维晶体。其空间周期性可通过施加磁场轻松调节，这使这些系统成为探索磁振子能带结构如何随晶格常数\(a\)演化的有吸引力的平台，而这在物理图案化材料中很难实现。在这项工作中，我们采用微磁模拟来计算模型铁石榴石薄膜的自旋波谱，重点关注外场和立方各向异性的影响。我们发现，布里渊区中心（\(k = 0\)）和区边界（\(k = \pm \pi/a\)）处的带隙对外加场的响应不同，出现在很宽的频率和波矢范围内。当存在垂直磁场或立方各向异性时，在约化布里渊区中间（\(k = \pm \pi/2a\)）会出现额外的带隙。这种行为被解释为畴壁晶格的皮尔斯型畸变，其中“上”和“下”畴在有效垂直场的影响下交替膨胀和收缩。
英文摘要
Ordered stripe domains in ferromagnetic thin films form a natural one-dimensional crystal for propagating spin waves. Their spatial periodicity can be tuned readily with an applied magnetic field, making these systems an attractive platform for exploring how magnon band structures evolve as a function of the lattice constant $a$, a tuning that is difficult to achieve in physically patterned materials. In this work we employ micromagnetic simulations to calculate the spin-wave spectra of a model iron-garnet film, focusing on the influence of the external field and of cubic anisotropy. We find that band gaps at the Brillouin-zone center ($k = 0$) and at the zone boundary ($k = \pm π/a$) respond differently to the applied field, appearing over a broad range of frequencies and wave vectors. When a perpendicular magnetic field or cubic anisotropy is present, additional gaps can appear at the middle of the reduced Brillouin zone ($k = \pm π/2a$). This behavior is interpreted as a Peierls-type distortion of the domain-wall lattice, wherein ``up'' and ``down'' domains alternately expand and contract under the influence of the effective perpendicular field.
Comments10 pages, 9 figures
