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Title: Room-temperature ferromagnetism of Cu-doped ZnO films probed by soft x-ray magnetic circular dichroism
Authors: Herng, T.S. 
Qi, D.-C. 
Berlijn, T.
Yi, J.B. 
Yang, K.S.
Dai, Y.
Feng, Y.P. 
Santoso, I. 
Sánchez-Hanke, C.
Gao, X.Y. 
Wee, A.T.S. 
Ku, W.
Ding, J. 
Rusydi, A. 
Issue Date: 8-Nov-2010
Citation: Herng, T.S., Qi, D.-C., Berlijn, T., Yi, J.B., Yang, K.S., Dai, Y., Feng, Y.P., Santoso, I., Sánchez-Hanke, C., Gao, X.Y., Wee, A.T.S., Ku, W., Ding, J., Rusydi, A. (2010-11-08). Room-temperature ferromagnetism of Cu-doped ZnO films probed by soft x-ray magnetic circular dichroism. Physical Review Letters 105 (20) : -. ScholarBank@NUS Repository.
Abstract: We report direct evidence of room-temperature ferromagnetic ordering in O-deficient ZnO:Cu films by using soft x-ray magnetic circular dichroism and x-ray absorption. Our measurements have revealed unambiguously two distinct features of Cu atoms associated with (i) magnetically ordered Cu ions present only in the oxygen-deficient samples and (ii) magnetically disordered regular Cu2⊃+ ions present in all the samples. We find that a sufficient amount of both oxygen vacancies (VO) and Cu impurities is essential to the observed ferromagnetism, and a non-negligible portion of Cu impurities is uninvolved in the magnetic order. Based on first-principles calculations, we propose a microscopic "indirect double-exchange" model, in which alignments of localized large moments of Cu in the vicinity of the VO are mediated by the large-sized vacancy orbitals. © 2010 The American Physical Society.
Source Title: Physical Review Letters
ISSN: 00319007
DOI: 10.1103/PhysRevLett.105.207201
Appears in Collections:Staff Publications

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