The propagation dynamics of spin waves are represented by their dispersion relations. Recently, we have developed a method, called spin-wave tomography (SWaT), to obtain dispersion relation of spin waves in the long wavelength regime, so-called pure magnetostatic waves. In our previous studies on SWaT, phase information of spin waves was disregarded. In this report, we demonstrate an advanced SWaT analysis, called phase-resolved spin-wave tomography (PSWaT), to realize the direct observation of the amplitude and the phase of spin waves. The PSWaT spectra are obtained by separating the real and the imaginary components of the complex Fourier transform in the SWaT analysis. We demonstrate the PSWaT spectra of spin waves excited by the photo-induced demagnetization in a Bi-doped garnet film, reflecting the characteristic features of the complex dynamical susceptibility affected by magnetostatic coupling in the film.

中文翻译：

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相位分辨自旋波断层扫描

自旋波的传播动力学由它们的色散关系表示。最近，我们开发了一种称为自旋波断层扫描 (SWaT) 的方法，以获得长波长范围内自旋波的色散关系，即所谓的纯静磁波。在我们之前对 SWaT 的研究中，自旋波的相位信息被忽略了。在本报告中，我们展示了一种先进的 SWaT 分析，称为相位分辨自旋波断层扫描 (PSWaT)，以实现对自旋波幅度和相位的直接观察。PSWaT 光谱是通过在 SWaT 分析中分离复傅立叶变换的实部和虚部而获得的。我们展示了 Bi 掺杂石榴石薄膜中光致退磁激发的自旋波的 PSWaT 光谱，