Fig. 3: k-space spectra intensity of incident and reflected spin waves.

a Cross-sectional view of Spin wave tomography spectra at the frequency f = 1.53 GHz obtained by analyzing the series of images taken from the sample with out-of-plane magnetization. a (b) The spectrum before (after) the incidence of a spin wave. White arrows indicate the wavevector k = (k_x, k_y) of the incident and reflected waves. Spectrum peak is split into two after the incidence to the sample edge. c Spectrum intensity as a function of k_x at k_y = 1.18 × 10⁴ (rad cm⁻¹) in the out-of-plane magnetized sample. The spectral intensity has two peaks indicated by red inverted triangles. d Cross-sectional view of Spin wave tomography spectra at f = 1.20 GHz obtained from the in-plane magnetized sample. d (e) The spectrum before (after) the incidence of a spin wave. A single spectrum peak appears before and after the incidence. f Spectrum intensity as a function of k_x at k_y = 1.00 × 10⁴ (rad cm⁻¹) in the in-plane magnetized sample. Contrary to (c), only the single peak appears.