  Dislocation waves in magnetic crystals in the vicinity of orientation phase
transition (OPT) temperatures are considered in a frame of the field theory of
the defects. The singularities of the dislocation flows, elastic deformations
and magnetization occur if the magnetic subsystem is inhomogeneous and the
dispersion of the media is not taken into account. Media dispersion causes a
regularity of these parameters and a conversion of the spin wave to the
dislocation wave.
