| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetism of a Nitrogen-Implanted TiO2 Single Crystal |
| LIU Chun-Ming1**, XIANG Xia1, ZHANG Yan2, JIANG Yong1, ZU Xiao-Tao1
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1Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054
2School of Physics, Peking University, Beijing 100871
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| Cite this article: |
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LIU Chun-Ming, XIANG Xia, ZHANG Yan et al 2011 Chin. Phys. Lett. 28 127201 |
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Abstract Single rutile crystal TiO2 was implanted using nitrogen ions with energy of 60 keV. The microstructure, ultraviolet−visible light absorption spectra, conductivity and magnetism are investigated. Except for the nitrogen dopant, no impurity can be detected by x-ray diffraction and x-ray photoelectron spectra. The absorption in the visible light region is enhanced with nitrogen implantation dose increasing. By measuring the temperature dependence of resistance, it is found that the sample implanted with 1×1018 ions/cm2 is changes from insulating to semiconducting, and the variable range hopping is the main conducting mechanism. Room-temperature ferromagnetism is also obtained in this sample. The magnetism as a function of temperature can be well fitted using the three-dimensional spin wave model plus the Curie–Weiss model, indicating that there is a mixed phase of ferromagnetism and paramagnetism.
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| Keywords:
72.20.-i
75.50.-y
78.20.-e
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Received: 14 May 2011
Published: 29 November 2011
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| PACS: |
72.20.-i
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(Conductivity phenomena in semiconductors and insulators)
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75.50.-y
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(Studies of specific magnetic materials)
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78.20.-e
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(Optical properties of bulk materials and thin films)
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