Dynamic studies of γ-Fe2O3 nanoparticle systems

The dynamic properties of two series of samples of γ-Fe 2 O 3 nanoparticles (average diameter = 4.7 and 8.3 nm), dispersed in a polymer, were investigated by means of linear and non-linear AC susceptibility measurements over a large frequency range (5 < v < 10 4 Hz). The temperature and frequency dependence of both linear and non-linear susceptibilities was analysed for different degrees of dispersion of particles in the polymer, i.e. for different strengths of inter-particle interactions. 2001 Elsevier Science B.V. All rights reserved.