Fe-doped ZnO nano-rods have been simply synthesized by a hydrolysis method. The starting Zn and Fe nano-powders were incorporated into distilled water, and then the solution was refluxed at 60 °C for 24 h to obtain the precipitation of hydroxide gel from the hydrolysis of Zn and Fe. Finally the thermal treatment was carried out at 300 °C for 1 h. X-ray diffraction patterns for all samples exhibited that the resultant precipitates were completely ZnO powder. The TEM result for Fe-doped ZnO showed rod shape with diameter of 30nm and length of 300nm. With increasing Fe content up to 2 wt.%, the UV-vis spectra were shifted to the long wave length and this result indicates that the band gap was shifted by Fe-doping. Whereas the sample with 5wt.% Fe-doping showed the ferromagnetic behavior at room temperature, the ferromagnetic properties disappeared at the samples with above 5 wt % Fe-doping.

NiFe2O4 nano particles were synthesized by a simple levitational gas condensation (LGC) using Ni and Fe metal powder as starting materials. The TEM image reveals spherical particles with the range of the particle size from 8 to 22 nm. The Mössbauer spectrum revealed the presence of superparamagnetic phase with abnormal ionic states of Fe2+ and Fe3+