Ferromagnetic resonance in thin ferromagnetic film with surface anisotropy

TL;DR

This paper investigates how surface anisotropy affects ferromagnetic resonance frequencies in thin films, considering different magnetic field orientations and boundary conditions, aiding the interpretation of experimental data.

Contribution

It provides a theoretical analysis of ferromagnetic resonance in thin films with surface anisotropy, highlighting the dependence on film thickness and surface anisotropy constants.

Findings

Resonance frequency depends on film thickness and surface anisotropy.

Surface anisotropy significantly influences resonance behavior.

Results assist in interpreting broadband ferromagnetic resonance experiments.

Abstract

The ferromagnetic resonance frequencies are obtained for a thin ferromagnetic film with surface anisotropy for the cases when the external magnetic field is applied perpendicularly or parallel to the film surface, and for various combinations of boundary conditions on the film surface. It is shown that in the presence of surface anisotropy the ferromagnetic resonance frequency essentially depends both on the film thickness and on the value of the surface anisotropy constant. The results obtained provide a basis for the correct interpretation of experimental data obtained by means of broadband ferromagnetic resonance in thin film structures.