Study of the magnetic properties of Mg, Gd, and Co doped maghemite (?-Fe2O3) nanoparticles prepared by sol-gel

The gamma-Fe2O3 magnetic nanoparticles, prepared by sol gel route, were doped with Magnesium (Mg), Gadolinium (Gd), and Cobalt (Co) oxides to enhance their magnetic properties. The X-ray diffraction, of the prepared sam-ples, show that all samples crystallized under cubic structure with P4332 space group. The morphological properties of our nanopowders were studied with TEM investigations. The average nanoparticle sizes were distributed between 15 and 23 nm for both the pure and the doped samples. The magnetization as a function of temperature and magnetic field were measured to study the effect of the doping elements on the magnetic properties. The results show that the highest magnetization (MH) of our nanoparticles increases especially with increasing Mg, Gd and Co concentration It is also observed that cobalt doping increases the magnetic coercivity by increasing the value of the coercivity field (Hc) and remanence magnetisation (Mr), which can be used in magnetic recording devices.

Automated summary

In this study, gamma-Fe2O3 magnetic nanoparticles were prepared by the sol-gel method and doped with Magnesium (Mg), Gadolinium (Gd), and Cobalt (Co) oxides to enhance their magnetic properties. X-ray diffraction analysis showed that all samples had a cubic crystal structure with P4332 space group. TEM investigations revealed that the average nanoparticle sizes ranged from 15 to 23 nm for both pure and doped samples. The measurements of magnetization as a function of temperature and magnetic field demonstrated that the highest magnetization (MH) of the nanoparticles increased with increasing concentrations of Mg, Gd, and Co. Moreover, cobalt doping increased the magnetic coercivity by increasing the values of coercivity field (Hc) and remanence magnetisation (Mr), which could be utilized in magnetic recording devices.