CALCULATION OF FMR IN INTERACTING FINE-PARTICLE SYSTEMS

A computer model has been developed to simulate ferromagnetic resonanc e (FMR) in a randomly packed interacting fine particle system. Using S toner-Wohlfarth particles with a random distribution of easy axes, the FMR response was calculated from the second derivatives of the equili brium energy. The results show a qualitative agreement with available experimental data and are in agreement with previous mean field calcul ations. However, it is shown that the mean field theory does not predi ct changes in the interaction effects as the field is reduced from sat uration.