Permeability of ferromagnet in light field

The effective magnetic fields may be appeared in the transparent ferromagnet as a result of nonlinear interaction of the electrical component of the intensity light wave with the magnetic subsystem. Influence of these fields, because of thier weakness, will be considerable near by instability points, where sucseptebility is anamal large. Magnetic phase transitions under the action of the light field were studied earlier. In this paper the permeability and spectrum of the spin waves in presence of the light field are investigated.