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Ferromagnetism in p-type N-doped ZnO films, deposited on (0001) sapphire substrates by radio frequency (rf) reactive magnetron sputtering at different N2/O2 ratios, has been observed at room temperature. Both the p-type conduction and ferromagnetism are originated from the substitution of O with N. At the N2/O2 ratio of 15:15, the film displays the maximum hole density and the minimum resistivity...
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