COMPUTER-SIMULATION OF MAGNETIZATION REVERSAL OF CUBIC, THIN AND ELONGATED PARTICLES - EFFECT OF METHOD OF CALCULATING DEMAGNETIZING FIELD

Computer simulation was used to investigate the dependence of the switching fields and magnetization reversal mechanisms of cubic, thin and elongated particles on the angle of applied fields. In the simulation, the particles were divided or not divided into cells. The particles switch mostly in the coherent rotation mode. However, the switching field of the thin or elongated particle obtained by dividing the particle into cells does not coincide with the switching field of the particle obtained without dividing the particle into cells, except when a field is applied in the largest plane of a thin particle with the intrinsic uniaxial easy axis in the plane. The non-coincidence of the switching fields is due to the improper calculation method of the demagnetizing field. If the average demagnetizing fields, which are obtained by dividing the particles into cubic cells, are used in the undivided particle cases, the switching fields of the undivided particles coincide with the switching fields of the divided particles.