However, the magnetization values of all the Mg0.2Ca0.8Fe2O4 nanoparticles prepared in the present work are considerably higher than those reported for MgFe2O4 nanoparticles (from around 10 to 23 emu/g) prepared by the low-temperature solid state reaction method [22]; the saturation magnetization of these MgFe2O4 nanoferrites increased as the particle size was increased from 16 to 40 nm due to a higher number of grain boundaries and the large surface area supplying more pinning sites for domain walls [22].