论文标题
用不均匀的垂直磁晶对植物的解毒晶格中的自旋波光谱
Spin-wave spectra in antidot lattice with inhomogeneous perpendicular magnetocrystalline anisotropy
论文作者
论文摘要
宏伟的晶体是具有定期多样化的磁性特性的结构，用于控制集体自旋波激发。使用微磁模拟，我们基于具有垂直磁各向异性（PMA）的多层薄膜研究2D解毒晶状体中的自旋波光谱。我们表明，即使在完全饱和的状态下，解毒片边缘附近的PMA的修饰也引入了有趣的修饰。特别是，光谱分为两种激发，幅度浓缩的散装模式集中在动力学晶格的均匀部分中，边缘模式的振幅位于降低的pMA边缘的边缘，在解毒剂边缘的降低。它们对几何或材料参数的依赖性是不同的，但在满足共振条件下，我们发现散装模式和径向边缘模式之间的强烈杂交。有趣的是，散装和边缘的基本模式之间的杂交是磁性的，但是交换相互作用决定了高阶径向边缘模式与解毒晶格的基本散装模式之间的耦合。
Magnonic crystals are structures with periodically varied magnetic properties that are used to control collective spin-wave excitations. With micromagnetic simulations, we study spin-wave spectra in a 2D antidot lattice based on a multilayered thin film with perpendicular magnetic anisotropy (PMA). We show that the modification of the PMA near the antidot edges introduces interesting modifications to the spin-wave spectra, even in a fully saturated state. In particular, the spectra split in two types of excitations, bulk modes with amplitude concentrated in a homogeneous part of antidot lattice, and edge modes with an amplitude localized in the rims of reduced PMA at the antidot edges. Their dependence on the geometrical or material parameters is distinct but at resonance conditions fulfilled, we found strong hybridization between bulk and radial edge modes. Interestingly, the hybridization between the fundamental modes in bulk and rim is of magnetostatic origin but the exchange interactions determine the coupling between higher-order radial rim modes and the fundamental bulk mode of the antidot lattice.
