The monograph is devoted to the consideration of dynamic phenomena in a medium with magnetic ordering that occur when the orientation of the equilibrium state of the magnetization vector changes. Spatially homogeneous change of magnetization under conditions of orientation transition is considered, as well as spatially inhomogeneous within domain boundary and structure as a whole. Models of ferromagnetic resonance, propagation of magnetostatic waves and local disturbances of magnetization such as solitons were built. Results of experimental study of magnetostatic waves in film of ferrite-garnet in unsaturated state are presented.