Modeling of elongated fine ferromagnetic particles

摘要: This paper presents some results of a numerical micromagnetic calculation for ferromagnetic fine particles. Two basic shapes are discussed: elongated parallelopipeds and with pointed ends. The variation coercivity, switching field, reversal modes particle size, orientation, material parameters discussed. Equilibrium magnetization structures suggest that particles may have remanent states substantially nonuniform. flipping mode, in which the starts from longitudinal ends particles, is found to be energetically favorable mechanism. Small switched by quasi‐coherent while large reversed quasi‐curling mode. angular dependence coercive fields three sizes agree qualitatively classical results, but both quantitatively smaller. nucleation field compared Stoner–Wohlfarth model as well curling about half their value.