Figure 1: Schematic illustration of spin wave tomography.
From: All-optical observation and reconstruction of spin wave dispersion
Spin-wave tomography (SWaT) is based on the observation of the propagation dynamics of spin waves with the pump-and-probe magneto-optical imaging method. Various modes of spin waves are excited simultaneously by the illumination of the pump laser pulse in magnetic materials. The propagation dynamics of the spin waves are measured through the Faraday effect on the probe pulse (θF), which is proportional to the magnetization along the direction normal to the sample surface (mz). The images of θF are obtained by analyzing the transmission images (Iα) observed at various angles of the analyzer (α)26. The spin-wave dispersion relations are reconstructed by Fourier transforming the propagating waveform of the spin waves.
