On the origin of the ferromagnetism in Zn0.8Mn0.2O having a higher Curie temperature than Zn0.8Co0.2O |
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| Authors: | Chia-Lung Tsai Yow-Jon Lin Jia-Hong Chen Hsing-Cheng Chang Ya-Hui Chen Lance Horng Yu-Tai Shih |
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| Affiliation: | 1. Institute of Photonics, National Changhua University of Education, Changhua 500, Taiwan;2. Department of Automatic Control Engineering, Feng Chia University, Taichung 407, Taiwan;3. Ph. D. Program in Electrical and Communications Engineering, Feng Chia University, Taichung 407, Taiwan;4. Department of Physics, National Changhua University of Education, Changhua 500, Taiwan;1. I3N-Aveiro, Department of Physics, University of Aveiro, Aveiro 3810 193, Portugal;2. Department of Materials and Ceramics Engineering, University of Aveiro, Aveiro 3810 193, Portugal;3. Advanced Magnetics Group, Defence Metallurgical Research Laboratory, Defence Research, Development Organization, Kanchanbagh, Hyderabad 500058, India;1. Department of Chemical Engineering, University of Washington, Seattle, WA 98195-1750, USA;2. Department of Materials Science & Engineering, Seattle, WA 98195-2120, USA;3. Fundamental Computational Science Directorate, Pacific Northwest National Laboratory, Richland, WA, USA;1. School of Materials Science and Engineering, The Key Laboratory of Material Processing and Mold of Ministry of Education, Zhengzhou University, Zhengzhou, PR China;2. Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA |
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| Abstract: | Zn0.8Co0.2O and Zn0.8Mn0.2O films were deposited on substrates by a sol–gel technique. X-ray diffraction, field-emission scanning electron microscopy, photoluminescence, and ferromagnetism measurements were used to characterize these dilute magnetic semiconductors. It is shown that the ferromagnetic properties might be related to the formation of acceptor-like defects in the Zn0.8Co0.2O and Zn0.8Mn0.2O films. It is found that ferromagnetic Zn0.8Mn0.2O has a higher Curie temperature than Zn0.8Co0.2O. In addition, the higher ratio of grain-boundary area to grain volume of Zn0.8Mn0.2O than Zn0.8Co0.2O indicates that grain boundaries and related acceptors are the intrinsic origin for ferromagnetism. |
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