Abstract:
Volumetric ceramic samples of ZnO doped with Fe and Li were obtained by conventional solid-state reaction. The morphology of the surface of cross-section of samples was investigated by scanning electron microscope and the crystallite size were estimated. The results of X-ray energy dispersive analysis (EDX) confirmed homogeneous distribution of iron and zinc by the volume of the samples and that their stoichiometric compositions. It was found that all the samples had a hexagonal wurtzite structure. Powder X-ray analysis showed the presence in the samples of the second phase of Fe3O4. Investigations the magnetic properties of ZnO: Li, Fe were made using an automated SQUID magnetometer. The increase of the Li content in the samples doped with Fe led to the decrease in magnetization and the disappearance of maximum corresponding to a transition ferromagnetic paramagnetic. The increase in the Fe content in the range $0{,}06\le y \ge 0{,}25$ causes the increase in the magnetization of the sample while the position of the magnetic phase transition point $T_c ~ 14 K$ does not change. It is assumed that the magnetic properties of samples of ZnO: Li, Fe at low temperatures determined by the presence in the material of the second ferromagnetic phase.
Keywords:zinc oxide, dilute magnetic semiconductors, magnetization, spintronics.
