Abstract
Zn 0.95 − x Co 0.05 Li x O (x=0–0.12) thin films were synthesized by sol-gel method. Magnetic investigation showed that the ferromagnetism of the Zn0.95−xCo0.05LixO films increased with Li doping within the solubility limit of 9% but dropped sharply when x>9% owing to the presence of the second-phase LiCoO2. X-ray diffraction, UV-visible absorption spectrum (UV-vis), Raman spectrum (Raman), and electrical resistivity investigation indicated that the Li-doping process in Zn0.95Co0.05O was of three stages. The structure and magnetic properties of Zn0.95−xCo0.05LixO films had different change trends in different stages. It was found that not only LiZn′ related defects but also Li+ interstitials played important roles in enhancing the magnetic interaction between Co2+ ions, which was supported by the bound magnetic polaron model.
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