Stable states of vortex-like magnetic formations in inhomogeneous magnetically uniaxial films and their behavior in a longitudinal magnetic field

Abstract

This paper looks into the magnetization reversal processes of uniaxial ferromagnetic films with spatially modulated material parameters. It has been established that four types of vortex-like inhomogeneities can form on columnar defects of a certain type in such films, with these inhomogeneities having a nontrivial configuration of magnetic moments and differing in their topological parameters. It has been shown that in a magnetic field, their structure transforms into two or three stages, such transformation depending both on the topological charge and on the polarity of their core. A diagram of their stable states has been constructed, and a range of material parameters has been determined within which they can exist only in the presence of a magnetic field. The methods for producing such films have been considered.