Fig. 5: Brillouin light scattering (BLS) enhancement at the edges of a large silicon disk.

a BLS spectra acquired in the field of 550 mT on the right edge (red line), and on the top edge (green line) of a large silicon disk compared with the spectra measured on a bare permalloy film (black line) with magnetization M pointing in the y − direction, see schematic. Blue lines represent analytically calculated dispersion relation for Damon-Eshbach (DE) (light blue solid line) and backward-volume (BV) (dark blue dashed line) spin waves. The error band is calculated from the Poisson distribution. b BLS line scan across the right edge of the large silicon disk. The edge position is marked by the light gray dashed line. c, d Integrated detection function and half-width-at-tenth-maximum (HWTM) of the detection function extracted from a fit to the data presented in (b). e 2D detection function extracted from a fit to the data measured at the right edge of the disk.