Study Of Oxide-diluted Magnetic Semiconductors

This paper gives the recent studies of Mn-doped ZnO and (Co, Mn), (Mg, Mn)-doped ZnO thin films on growth preparation, structure, optical properties and magnetic properties. The results have shown that Mn-doped ZnO crystal structure did not cause significant changes in hexagonal wurtzite structure, but the ZnO lattice constant became larger suggesting larger radius of Mn ions replacing Zn ions. Mn doping leads to deterioration of film crystallinity, and changed optical properties of ZnO thin films. Theses samples exhibit ferromagnetism at room temperature.Transition metal co-doped ZnO thin films also did not change the microstructure of ZnO. However, the poor quality and the rough surface morphology were observed. Theses samples exhibit the light-emitting propertiy. From photoluminescence spectra, the emission bands with purple and green emission can be seen. Co-doped ZnO exhibit the ferromagnetic property.Theoretical and experimental results show Mn in the ZnO has a higher solubility. The conductive Mn-doped ZnO materials with hole carriers are most likely to have room temperature ferromagnetism. The co-doping and the formation of defects can produce more holes, it may be more beneficial to produce room temperature ferromagnetism. We need to further study the origin of ferromagnetic and to explore its relationship with transition elements Mn-doped ZnO thin films co-doped Technology. The futher studies are to obtain high-quality, stable doped ZnO thin films, as well as the doping on the luminescence properties of ZnO thin films and so on.