Large magnetic moment obtained in Cu-doped ZnO nanoclusters

Cu-doped ZnO nanocluster-assembled films were deposited by nanocluster-beam deposition. Zn
0.985
Cu
0.014
O nanoclusters remained in wurtzite structure with size of 8 nm. Room-temperature ferromagnetism was observed in the Cu doped ZnO nanocluster-assembled film. Moreover, it exhibited a large saturated magnetization of 1.37µ
B
/Cu and increased to 3.68µ
B
/Co after the deposition time was increased. The possible mechanisms on the observed ferromagnetism and enhanced magnetic moments are discussed here.