The Investigation of Superparamagnetic Colloidal Particles FemOn-SiO2
Colloidal particles based on iron oxides and silica were obtained by sol-gel method. Hysteresis curves at various temperatures were built by MPMS SQUID VSM. Theoretically calculated values of samples remanent magnetization were compared to experimental data. Despite of the average particles size about 10 nm sample has remanent magnetic moment. The phenomena may be explained on the basis of magnetostatic interaction between particles. The magnetic state of analyzed samples can be conditional on the presence of several phases with very different magnetic properties or the size effect.
Nikolay Gennadievich Galkin
P. V. Kharitonskii et al., "The Investigation of Superparamagnetic Colloidal Particles FemOn-SiO2", Solid State Phenomena, Vol. 247, pp. 138-141, 2016