Samples of the chemical formula Cu0.5Zn0.5Fe2-xSmxO4 where x = 0.0, 0.02, 0.04, 0.06, 0.08 and 0.1 are studied. X-rays analysis indicated that all investigated samples are formed in a single cubic phase. The lattice parameter is found to increase relative to x = 0.0 except x = 0.02. The grain size is decreased for all samples relative to unsubstituted one except that with x = 0.02. It is noticed that the sample with x = 0.02 has the highest values of initial permeability, magnetization and Curie temperature, T-c. The homogeneity of the samples, the coercive field as well as Tc are found to decrease while the electrical resistivity increases with increasing Sm content.