The role of Zn interstitials in cobalt-doped ZnO diluted magnetic semiconductors

Tongfei Shi; Zhenguo Xiao; Zhijun Yin; Xinhua Li; Yuqi Wang; Hongtao He; Jiannong Wang; Wenshen Yan; Shiqiang Wei
May 2010
Applied Physics Letters;5/24/2010, Vol. 96 Issue 21, p211905
Academic Journal
Co-doped ZnO samples Zn1-xCoxO and CoyZn1-yO were prepared by the sol-gel and magnetron sputtering methods, respectively. Although the Co K-edge extended x-ray absorption fine structure spectra show that the doped Co ions are located at the Zn substitutional sites for both Zn1-xCoxO (x≤0.05) and CoyZn1-yO (y≤0.05) samples, magnetic measurements show paramagnetism in Zn1-xCoxO (x≤0.05) and high temperature ferromagnetism in CoyZn1-yO (y≤0.05). An experimental and numerical study of the O K-edge x-ray absorption near-edge structure spectra reveals that the incorporation of the Zn interstitials in the lattice is crucial to the appearance of high temperature ferromagnetism in CoyZn1-yO (y≤0.05) samples.


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