Magnetic excitations in insulators with emphasis on nonlinear effects

Abstract

The aspects of the study of magnetic excitations in insulators which will be discussed, are: - dispersion of spin waves in the ordered state, - dispersion and damping of spin waves in systems without long range order, - non-linear effects in 1-D magnets. The nonlinear effects will be discussed quite extensively in order to show how linear and nonlinear effects in the spin dynamics can be separated. This will give the possibility to discuss some experimental techniques and possibilities which have not been used very widely, like inelastic neutron scattering with full polarization analysis.