Magnetization reversal of small particles in oscillating magnetic field
Nonlinear behavior of single spherical particle and many-particle ensemble under the external oscillating magnetic field was studied using Landau-Lifshitz-Gilbert approach. The exact analytical formulae for calculating field frequency and initial moment's configuration dependence on system mean magnetization were obtained. Using asymptotic decomposition we got simple expressions for describing nonlinear dynamics of spherical particles in the cases of large and small frequencies. These solutions are in good agreement with numerical calculations of Landau-Lifshitz-Gilbert equation for considering systems.