Abstract The results of modelling of the excitation and propagation processes of exchange spin waves (ESW) in epitaxial films of yttrium iron garnet (YIG) are presented. It is shown that the origin of the efficient ESW excitation is magnetic inhomogeneity, which is always present in a thin transition layer at the interface between a magnetic film and a nonmagnetic substrate. It is found that the parameters of magnetic inhomogeneity significantly affect wave characteristics of the emitted ESWs. A method was proposed for employing ESWs to measure the magnetization distribution parameters over the thickness of the YIG film and the ESW dissipation parameter. The measured parameters were used to calculate the dispersion and attenuation of the ESWs, define their amplitude characteristics in continuous and pulsed regimes, and estimate their phase losses. It is shown that dissipative losses of ESWs are not significant. More significant losses can occur due to phase dispersion on non-parallel reflective surfaces of the YIG film. It is demonstrated that such phase losses can be significantly reduced by precision optical polishing of the YIG film samples.

中文翻译：

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交换自旋波及其在外延 YIG 薄膜层状结构诊断中的应用

摘要 介绍了钇铁石榴石 (YIG) 外延膜中交换自旋波 (ESW) 激发和传播过程的建模结果。结果表明，有效的 ESW 激发的起源是磁不均匀性，它总是存在于磁性薄膜和非磁性基板之间界面处的薄过渡层中。发现磁不均匀性参数显着影响发射的 ESW 的波特性。提出了一种使用 ESW 来测量 YIG 膜厚度上的磁化分布参数和 ESW 耗散参数的方法。测量的参数用于计算 ESW 的色散和衰减，定义它们在连续和脉冲状态下的幅度特性，并估计它们的相位损耗。结果表明，ESW 的耗散损失并不显着。由于 YIG 膜的非平行反射表面上的相位分散，可能会发生更显着的损失。结果表明，通过对 YIG 膜样品进行精密光学抛光，可以显着减少这种相损失。