Dynamic magnetization of γ-Fe2O3 nanoparticles isolated in an SiO2 amorphous matrix C. Caizer and I. Hrianca Eur. Phys. J. B, 31 3 (2003) 391-400 Published online: 14 February 2003 DOI: 10.1140/epjb/e2003-00047-1