Co-doped ZnO nanocluster-assembled films were deposited by nanocluster-beam deposition. nanoclusters remained wurtzite in structure with size of . Compared with bulk ZnO, a blueshift of was observed in the absorption edge of the film. Two photo-luminescence bands at 378 and were detected. Room-temperature ferromagnetism was observed in doped ZnO nanocluster-assembled film. Moreover, it exhibited a large saturated magnetization of and increased to after the film was annealed. The possible mechanisms on the observed ferromagnetism and enhanced magnetic moment were discussed.
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