微结构Co2Mn0.6Fe 0.4Si波导边缘模自旋波焦散线的非线性发射
Nonlinear emission of spin-wave caustics from an edge mode of a micro-structured Co2Mn0.6Fe0.4Si waveguide
摘要：
具有极低吉尔伯特阻尼的磁性赫斯勒材料有望显示出新颖的磁子输运现象。我们报告的高次谐波的非线性产生导致的焦散自旋波光束的发射在低阻尼，微结构的Co2Mn0.6Fe0.4Si Heusler波导。高次谐波产生的源是由自旋波波导边缘处的强非均匀场分布形成的局域边缘模。根据磁性薄膜中自旋波的各向异性色散，通过解析计算，描述了在两倍和三倍激发频率下观察到的传播焦散波的辐射特性。
英文摘要：
Magnetic Heusler materials with very low Gilbert damping are expected to show novel magnonic transport phenomena. We report nonlinear generation of higher harmonics leading to the emission of caustic spin-wave beams in a low-damping, micro-structured Co2Mn0.6Fe0.4Si Heusler waveguide. The source for the higher harmonic generation is a localized edge mode formed by the strongly inhomogeneous field distribution at the edges of the spin-wave waveguide. The radiation characteristics of the propagating caustic waves observed at twice and three times the excitation frequency are described by an analytical calculation based on the anisotropic dispersion of spin waves in a magnetic thin film.
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