论文标题
在Dzyaloshinskii-Moriya相互作用的存在下，自旋镜的外轴聚焦
Off-axial focusing of spin-wave lens in the presence of Dzyaloshinskii-Moriya interaction
论文作者
论文摘要
从理论上讲，我们研究了Dzyaloshinskii-Moriya相互作用（DMI）对由两个磁性膜之间的圆形界面构造的自旋镜头的聚焦。我们通过分析在弯曲的几何形状和焦点的位置中得出广义的Snell定律，该定律表现出特殊的外轴聚焦行为。我们发现焦点对材料参数和入射自旋波的频率的强烈依赖性。完整的微磁模拟与理论预测很好地比较。我们的发现将有助于操纵手性磁铁中的自旋波和设计功能性镁性设备。
We theoretically study the effect of Dzyaloshinskii-Moriya interaction (DMI) on the focusing of a spin-wave lens that is constructed by a circular interface between two magnetic films. We analytically derive the generalized Snell's law in the curved geometry and the position of the focal point which exhibits a peculiar off-axial focusing behavior. We uncover a strong dependence of the focal point on both the material parameters and the frequency of incident spin waves. Full micromagnetic simulations compare well with theoretical predictions. Our findings would be helpful to manipulate spin waves in chiral magnets and to design functional magnonic devices.
