Temperature-dependent magnetization dynamics of magnetic nanoparticles

Recent experimental and theoretical studies show that the switching behavior of magnetic nanoparticles can be controlled well by external time-dependent magnetic fields. In this work, we inspect theoretically the influence of temperature and magnetic anisotropy on the spin dynamics and switching properties of single domain magnetic nanoparticles (Stoner particles). Our theoretical tools are the Landau-Lifshitz-Gilbert equation extended to deal with finite temperatures within a Langevin framework. Physical quantities of interest are the minimum field amplitudes required for switching and the corresponding reversal times of the nanoparticle's magnetic moment. In particular, we contrast the cases of static and time-dependent external fields and analyze the influence of damping for a uniaxial and a cubic anisotropy