Size dependence of the magnetization reversal in a ferromagnetic particle

[Display omitted] •The micromagnetic model and the finite elements method are used for the simulation.•Different reversal mechanisms are obtained as the particle’s size increases.•Magnetic parameters are continuous functions of the inverse of the radius. In this work the finite elements method is used to simulate by micromagnetic modelling the behavior of a spherical ferromagnetic particle with uniaxial magnetocrystalline anisotropy. Full magnetization loops are taken in the easy axis direction at different values of anisotropy constant and particle size. The results indicate reversal mechanisms such as the coherent rotation, the curling mode and the growth of a reverse magnetization domain. The size dependence of critical fields and of other magnetic parameters, such as the nucleation volume of the reverse domain, the domain wall width and the susceptibility, is presented.