Experimental studies of neodymium ferrites doped with three different transition metals

In this work we report the synthesis, the microstructural characterization and the magnetic properties of neodymium spinel ferrites doped with transition metal (Co, Ni, Mn) nanoparticles prepared by co-precipitation method. The effect of different doping elements (Cobalt, Nickel and Manganese) on the structural and magnetic properties was studied. The Nd0.5Ni0.5Fe2O4 and Nd0.5Mn0.5Fe2O4 nanoparticles prepared possess superparamagnetic phases; however the Nd0.5Co0.5Fe2O4 nanoparticles have a ferrimagnetic phase. The observed saturation magnetization and the remanent magnetization values of Nd0,5Co0,5Fe2O4, Nd0,5Ni0,5Fe2O4 and Nd0,5Mn0,5Fe2O4 are higher than NdFe2O4. Moreover, the coercive field for Ni-Nd ferrite and Mn-Nd ferrite are lower than that observed for NdFe2O4. In this work, the coercive field for Co-Nd ferrite is higher than that obtained for NdFe2O4.