Resonant properties of superparamagnetic materials for small amplitudes of the periodic field

Calculations of the dynamic susceptibility for the ensemble of ferromagnetic single-domain particles (also know as superparamagnetic) with anisotropy were carried out with aid of the numerical solution of the Brown kinetic equation. The result was obtained for different sets of parameters that are a frequency of the driving magnetic field the temperature of a sample and the cubic anisotropy direction. The way to calculate the susceptibility of the superparamagnetic material without significant computational cost for low amplitudes of driving field and a small value of the dissipation coefficient was proposed.