发表机构
Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau; University of Vienna, Faculty of Physics; University of Western Australia, Department of Physics M013（莱茵兰-普法尔茨技术大学凯泽斯劳滕-兰道校区; 维也纳大学物理学院; 西澳大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文通过高分辨率参数不稳定性光谱法研究微米厚钇铁石榴石薄膜中厚度量子化磁子的阻尼，发现各向异性的波矢依赖阻尼随模式数增加而增大，且对平面内和平面外波矢分量依赖不同。
AI 中文摘要
磁子阻尼是控制自旋波输运和多模磁子系统非线性动力学的关键因素。然而，许多描述依赖于有效模式无关参数的假设，这可能掩盖依赖于传播几何和模式轮廓的波长相关弛豫过程。在此，我们采用高分辨率参数不稳定性光谱法，探测微米厚钇铁石榴石薄膜中波长低至约一百纳米的厚度量子化自旋波。不稳定性阈值对磁场表现出规则的锯齿状依赖关系，源于离散厚度模式之间的切换。与偶极-交换理论的比较揭示了各向异性的波矢依赖阻尼，该阻尼随模式数增加而增大，并且对平面内和平面外波矢分量的依赖不同。
英文摘要
Magnon damping is a key factor governing spin-wave transport and nonlinear dynamics of multimode magnon systems. However, many descriptions rely on the assumption of an effective mode-independent parameter, which can mask wavelength-dependent relaxation processes that depend on propagation geometry and mode profile. Here, we employ high-resolution parametric-instability spectroscopy to probe thickness-quantized spin waves with wavelengths down to about a hundred nanometers in micrometer-thick yttrium iron garnet films. The instability threshold exhibits a regular sawtooth dependence on the magnetic field, arising from switching between discrete thickness modes. Comparison with dipole--exchange theory reveals anisotropic wavevector-dependent damping that increases with mode number and depends differently on the in-plane and out-of-plane wavevector components.
