Brillouin Light Scattering: Magnetic Materials Characterization

This lecture covers the principles and applications of Brillouin Light Scattering (BLS) technique for characterizing magnetic materials. It explains the inelastic scattering process, energy conservation, and moment conservation in Brillouin scattering. The lecture delves into the differences between Brillouin and Raman scattering, the Fabry-Perot interferometer, and the use of linearly polarized light for polarization control. It also explores Brillouin scattering for magnonics research, including spin waves, magnon band structure, and Bose-Einstein condensation. The lecture demonstrates the multiple functions of BLS, such as spatial-resolved, wavevector-resolved, time-resolved, and phase-resolved functions, and provides examples of characterizing magnetic materials with non-collinear spin textures.