Magnetic and structural properties of novel-coated multi-doped Ni-Co ferrite nanomaterial: Experimental and theoretical investigations

摘要

In this paper, the magnetic properties of Ni0.5Co0.5Fe1.59Mo0.1Gd0.2Sm0.1Tb0.01O4 nanoparticles coated with oleic acid and prepared for the first time by the co-precipitation method were studied using magnetic property measurement system. TGA analysis was used to analyze the thermal behavior of the obtained precipitate. The formation of a pure phase of spinel nanoparticles with a mixed structure coated with oleic acid was confirmed by X-ray diffraction. The formation of crystallographic sites of spinel structure and the presence of oleic acid on the surface of nanoparticles was confirmed by infrared spectroscopy (FTIR). Transmission electron microscopy shows that the nanoparticles have a spherical shape morphology. The magnetic properties were determined at three different temperatures (5, 80, and 300 K) and revealed that the synthesized material has a superparamagnetic behavior. DFT calculations were performed to study the effect of doping the Ni-Co spinel ferrite with Mo, Sm, Tb, and Gd.