Nanometre-sized iron particles with diameters in the range 5-8.5 nm have been grownwithin a 30Na2O-60SiO2-10B2O3 glassmatrix using a 3Na+ï« Fe3+ exchange reaction followed by reduction treatment in hydrogen for different temperatures. Electron diffraction pattern shows the presence of FeO and á-Fe particles. Thermal characteristicswere studied byDSCwhile the nanoscale-related magnetic properties were investigated by VSM. The results show depression of magnetization as a function of temperature. This behaviour indicates the occurrence of spin-wave fluctuation in iron core of the studies samples.