Magnetic susceptibility investigation of magnetic nanoparticles in styrene-divinylbenzene mesoporous template

In this study, dynamical susceptibility (DS) was used to investigate magnetite-based composites. The field dependence of peaks observed in the DS curves was analyzed within the picture of an asymmetric double well potential for the relaxation of the magnetic moment associated to the magnetite nanoparticle. Parameters obtained from the analysis of the DS data indicate that different magnetite structure, build up from isolated nanoparticles, explains the features observed in the susceptibility curves