No abstract

It is shown that in ferromagnetic films with anisotropy inhomogeneous in thickness, an interphase boundary can be formed for certain values and directions of the magnetic field. This boundary has a stable magnetic configuration. It is oriented parallel to the film plane and separates the regions with different orientations of the magnetization. In an alternating magnetic field, the interphase boundary oscillates, which may be accompanied by a resonance. The field and frequency dependences of the components of the magnetic susceptibility tensor are determined. It is shown that the susceptibility coefficients at a resonance are extremely sensitive to the direction of the external magnetic field which can underlie the development of a highly sensitive sensor.

No 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.