CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Room-temperature anomalous Hall effect and magnetroresistance in (Ga, Co)-codoped ZnO diluted magnetic semiconductor films |
Liu Xue-Chao(刘学超)a), Chen Zhi-Zhan(陈之战) a)†, Shi Er-Wei(施尔畏)a), Liao Da-Qian(廖达前)b), and Zhou Ke-Jin(周克谨) c) |
a Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; b Department of Physics, The University of Warwick, Coventry, CV4 7AL, United Kingdom; c Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland |
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Abstract This paper reports that the (Ga, Co)-codoped ZnO thin films have been grown by inductively coupled plasma enhanced physical vapour deposition. Room-temperature ferromagnetism is observed for the as-grown thin films. The x-ray absorption fine structure characterization reveals that Co2+ and Ga3+ ions substitute for Zn2+ ions in the ZnO lattice and exclude the possibility of extrinsic ferromagnetism origin. The ferromagnetic (Ga, Co)-codoped ZnO thin films exhibit carrier concentration dependent anomalous Hall effect and positive magnetoresistance at room temperature. The mechanism of anomalous Hall effect and magneto-transport in ferromagnetic ZnO-based diluted magnetic semiconductors is discussed.
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Received: 21 May 2010
Revised: 09 October 2010
Accepted manuscript online:
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PACS:
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75.50.Pp
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(Magnetic semiconductors)
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75.70.-i
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(Magnetic properties of thin films, surfaces, and interfaces)
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75.70.Tj
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(Spin-orbit effects)
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78.70.Dm
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(X-ray absorption spectra)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50772122) and the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 51002176). |
Cite this article:
Liu Xue-Chao(刘学超), Chen Zhi-Zhan(陈之战), Shi Er-Wei(施尔畏), Liao Da-Qian(廖达前), and Zhou Ke-Jin(周克谨) Room-temperature anomalous Hall effect and magnetroresistance in (Ga, Co)-codoped ZnO diluted magnetic semiconductor films 2011 Chin. Phys. B 20 037501
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