Magnetic resonance of the interphase boundary in ferromagnetic films with modulated anisotropy under orientational phase transition conditions

Abstract

The Landau-Lifshitz equations for the dynamics of magnetization are used to describe the formation of an interphase boundary with spatial modulation of the anisotropy constant over the thickness of the film. The Lagrange equations for the collective variables of the magnetization field are derived and used to study the dynamics of the oscillations of the interphase boundary in a variable magnetic field. It is shown that under certain conditions the development of the resonance in the interphase boundary is extremely sensitive to the direction and magnitude of the external magnetic field. Therefore, it is natural to use this system as a highly directional magnetic field detector.