Figure 4: Time-resolved SWaT spectra.
From: All-optical observation and reconstruction of spin wave dispersion

(a,b) Time-resolved SWaT spectra with k parallel to M under in-plane magnetic fields of 560 Oe (a) and 40 Oe (b) respectively. The data was obtained by applying a time-window with the width of 2.8 ns centred at the time delay noted in each figure. (c) A three-dimensional contour plot (at the intensity of 0.97 in the scale shown in Fig. 2a) of the SWaT intensity obtained under the in-plane magnetic field of 40 Oe. The data shown in (b) was extracted along the cross-section shown as the yellow plane. (d) Temporal evolution of the time-resolved SWaT spectra obtained along the dashed white line in (b). The data was obtained by applying a time-window with the width of 1.0 ns. (e) A result of numerical calculations of the time-resolved SWaT spectra shown in (d).