Dynamic properties of interacting gamma-Fe2O3 particles

摘要

The dynamic properties of a series of samples of gamma-Fe2O3 particles with different aggregation states in a polymer mixture have been investigated by magnetization, ac susceptibility and Mossbauer spectroscopy measurements. The frequency dependence of the blocking temperature is satisfactorily described by a model based on a statistical calculation of the dipolar energy for a disordered assembly of particles with a volume distribution and easy axes in random directions.