TAHMINEH SODAEE - Department of Materials Engineering, Malek Ashtar University of Technology, Shahin Shahr, Isfahan, Iran,
ALI GHASEMI - Department of Materials Engineering, Malek Ashtar University of Technology, Shahin Shahr, Isfahan, Iran,
EBRAHM PAIMOZD - Department of Materials Engineering, Malek Ashtar University of Technology, Shahin Shahr, Isfahan, Iran

Terbium substituted cobalt ferrite with composition of CoFe2TbO4 nanoparticles (x = 0-0.5) were prepared employing a reverse micelle process. The effect of Tb cations substitution on structural and magnetic properties of cobalt ferrite nanoparticles was investigated. X-ray diffraction and fieldemission scanning electron microscopy evaluations demonstrated that single phase spinel ferrites with narrow size distribution were obtained. The particle size was beyond the range of superparamagnetic range. Vibrating sample magnetometer was employed to probe the magnetic properties of the samples. It was found that with an increase in terbium content, the coercive field decreases while the saturation of magnetization increases. The Mössbauer spectroscopy was used to determine the site preference of constitutive elements. It is interesting to find that adding terbium cations could enhanced saturation magnetization of cobalt ferrite and make it as a suitable candidate for recording head.Key words:

Cobalt ferrite,Terbium cation, Reverse micelle, Magnetic properties