Phase-resolved Spin-Wave Tomography

TL;DR

This paper introduces phase-resolved spin-wave tomography (PSWaT), an advanced method that captures both amplitude and phase of spin waves, providing deeper insight into their propagation dynamics and interactions.

Contribution

The study develops PSWaT by separating real and imaginary Fourier components, enabling direct observation of spin wave phase and amplitude, advancing previous spin-wave tomography techniques.

Findings

PSWaT successfully visualizes spin wave phase and amplitude.

The method reveals magnetostatic coupling effects in Bi-doped garnet films.

Results demonstrate detailed complex susceptibility features of spin waves.

Abstract

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.