Nanoscale physics
Resonance of interphase boundaries in ferromagnetic films with spatially inhomogeneous parameters
D.P. Azarkh1, Yu.I. Dzhezherya2
1 Faculty of Physics and Mathematics, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute". Prosp.Peremohy 37, Kyiv-03656, Ukraine.
E-mail: danila3a@gmail.com
2 Institute of Magnetism, Natl. Acad. of Sci. of Ukraine and Ministry for Ed. and Sci. of Ukraine. Vernadsky Blvd. 36-b, Kyiv-03680, Ukraine

Due to the discrepancy between the parameters of the crystal lattices of the substrate and the functional layer growth anisotropy arises in ferrite-garnet films deposited on a single-crystal garnet substrate. In some cases, it can vary through thickness.
It has been shown earlier that in systems with modulated through thickness anisotropy an interphase layering of the magnetization field takes place, where the homogeneous and inhomogeneous phases border each other [1]. A resonance oscillations of interphase boundaries is possible to observe in alternating magnetic fields. Here, we investigated the magnetization distributions and the dynamic properties of a system with a nonmonotonic dependence of the anisotropy parameter  (the Oz axis coincides with the film normal). It is shown that the magnetization distribution can be described as a three-phase structure where homogeneous phases bound a region with an inhomogeneous magnetization distribution for  (Fig. A). For the case of a negative value of , regions with an inhomogeneous distribution of the magnetization are separated by a homogeneous phase (Fig. B).
		
The resonance conditions for interphase boundaries oscillations were obtained. The frequency of natural oscillations  was determined (here M is the saturation magnetization, ρ is the constant of the orthorhombic anisotropy in the film plane, H is the magnetic field perpendicular to the film).

1.	Yu.I. Dzhezherya, D.P Azarkh, E.S. Klimuk, A.O Khrebtov Magnetic resonance of the interface boundary in a ferromagnetic film with modulated anisotropy under the orientational phase transition// Fizika Nizkikh Temperatur -2018.-44. N 1. –P. 59-65