Magneto-elastic coupling and domain structure in ferromagnetic films near the phase transition

Abstract

The magneto-elastic properties of thin ferromagnetic films near to the phase transition from the state of homogeneous magnetisation to the state of domain structure in the temperature region T<<Tc are considered. The phase transition is caused either by a change of the film thickness or external magnetic field. Formulae describing magnetic, magneto-elastic and elastic susceptibility tensors are derived. The dispersion relation describing the soft mode of coupled magnetic-elastic excitations is obtained.