Abstract
Four kinds of Li and Co codoped ZnO (LCZO) thin films have been prepared by a sol-gel process technique. X-ray diffraction results revealed that the LCZO thin films possess single ZnO wurtzite structure and c-axis preferred orientation, and Li and Co ions substitute for the Zn sites without changing the wurtzite structure. The current density of the LCZO films indicated that Li ions play a role of acceptors to increase the samples’ resistivity. All of the LCZO thin films show ferromagnetic properties, and ferromagnetic components increase with increasing Li doping concentration at room temperature, which is ascribed to the induced defects by Li doping that make the ferromagnetic coupling interactions between the Co ions more effective.
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