| Growth temperature dependent evolutions of microstructural, optical and magnetic properties of Zn0.75Co0.25O films |
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| 作者姓名： | 邱东江 冯春木 冯爱明 吴惠桢 |
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| 作者单位： | Department of Physics, Zhejiang University, Hangzhou 310027, China;Center of Analysis & Measurement, Zhejiang University, Hangzhou 310028, China;College of Metrology Engineering, China Institute of Metrology, Hangzhou 310018, China;Department of Physics, Zhejiang University, Hangzhou 310027, China |
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| 基金项目： | Project supported by the National
Natural Science Foundation of China (Grant No 50472058). |
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| 摘 要： | Zn0.75Co0.25O films are fabricated via reactive electron beam evaporation. The influence of growth temperature on the microstructural, optical and magnetic properties of Zn0.75Co0.25O films is investigated by using x-ray diffraction, selected area electron diffraction, field emission scanning electron microscope, high resolution transmitting electron microscope, photoluminescence （PL）, field dependent and temperature dependent DC magnetization, and x-ray photoelectron spectroscopy （XPS）. It is shown that Zn0.75Co0.25O films grown at low temperatures （250-350℃） are of single-phase wurtzite structure. Films synthesized at 300 or 350℃ reveal room temperature （RT） ferromagnetism （FM）, while su for 250℃ fabricated films is found above 56 K. PL and XPS investigations show favour towards the perspective that the O-vacancy induced spin-split impurity band mechanism is responsible for the formation of RT FM of Zn0.75Co0.25O film, while the superparamagnetism of 250℃ fabricated film is attributed to the small size effect of nanoparticles in Zn0.75Co0.25O film.
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| 关 键 词： | 电磁半导体 ZnO 光致发光 磁性 |
| 收稿时间： | 2007-06-23 |
| 修稿时间： | 9/3/2007 12:00:00 AM |
Growth temperature dependent evolutions of microstructural, optical and magnetic properties of Zn0.75Co0.25O films |
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| Qiu Dong-Jiang,Feng Chun-Mu,Feng Ai-Ming and Wu Hui-Zhen.Growth temperature dependent evolutions of microstructural, optical and magnetic properties of Zn0.75Co0.25O films[J].Chinese Physics B,2008,17(2):690-696. |
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| Authors: | Qiu Dong-Jiang Feng Chun-Mu Feng Ai-Ming and Wu Hui-Zhen |
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| Institution: | Center of Analysis & Measurement, Zhejiang University, Hangzhou 310028, China; College of Metrology Engineering, China Institute of Metrology, Hangzhou 310018, China; Department of Physics, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | Zn0.75Co0.25O films are fabricated via reactive electron
beam evaporation. The influence of growth temperature on the
microstructural, optical and magnetic properties of
Zn0.75Co0.25O films is investigated by using x-ray
diffraction, selected area electron diffraction, field emission
scanning electron microscope, high resolution transmitting electron
microscope, photoluminescence (PL), field dependent and temperature
dependent DC magnetization, and x-ray photoelectron spectroscopy
(XPS). It is shown that Zn0.75Co0.25OO films grown at low
temperatures (250--350\du) are of single-phase wurtzite structure.
Films synthesized at 300 or 350\du\ reveal room temperature (RT)
ferromagnetism (FM), while superparamagnetism for 250\du\ fabricated
films is found above 56K. PL and XPS investigations show favour
towards the perspective that the O-vacancy induced spin-split
impurity band mechanism is responsible for the formation of RT FM of
Zn0.75Co0.25O film, while the superparamagnetism of
250\du\ fabricated film is attributed to the small size effect of
nanoparticles in Zn0.75Co0.25O film. |
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| Keywords: | diluted magnetic semiconductor ZnO photoluminescence magnetic properties |
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