Computation of switching fields of stacked magnetic hexagonal platelet particles

Abstract

Switching fields of magnetic hexagonal platelet particles, which were stacked to the easy axis directions, were investigated by computer simulation. The particles had the easy axes perpendicular to the hexagonal planes. The angular dependence of the switching fields became smaller when more particles were stacked and when the particles were stacked closer together. This result is considered as one of the reasons for the small angular dependence of the remanence coercivity of a longitudinally oriented barium ferrite medium. Absence of exchange interaction between adjacent layers in a particle also reduces the angular dependence of the switching field.