Magnetization reversal mechanisms under oblique magnetic fields

In this work finite element micromagnetic simulations were performed in order to study the reversal mechanisms of spherical ferromagnetic particles with uniaxial magnetocrystalline anisotropy, when they are magnetized along an oblique direction with respect to the anisotropy axis. Magnetization loops are taken in different directions of external magnetic field, at different anisotropy constants and particle sizes. In the simulation results, the three reversal mechanisms (coherent, curling and domains) are observed and new phenomena arise due to the action of oblique magnetic fields. Moreover, the dependence of the critical fields with respect to the angle of the external field is presented. •Finite element micromagnetic simulation of the three different reversal mechanisms.•For the curling mechanism, the new phenomenon is the rotation of the vortex.•In the domain reversal mechanism, the formed domain wall is smaller than 180°.•In soft ferromagnetic particles a rearrangement of the magnetic domains is observed.