| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Preparation and Properties of Diluted Magnetic Semiconductors GaMnAs by Low-Temperature Molecular Epitaxy |
| JI Chang-Jian1**, ZHANG Cheng-Qiang1, ZHAO Gang2, WANG Wen-Jing1, SUN Gang1, YUAN Hui-Min1, HAN Qi-Feng3
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1Department of Physics, Qilu Normal University, Jinan 250013
2Department of Physics, Ludong University, Yantai 264025
3Department of Physics, Shanghai Normal University, Shanghai 200234
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| Cite this article: |
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JI Chang-Jian, ZHANG Cheng-Qiang, ZHAO Gang et al 2011 Chin. Phys. Lett. 28 097101 |
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Abstract GaMnAs films are prepared by low-temperature molecular beam epitaxy. Based on the experimental results, the influence of growth and annealing conditions on the physical properties and defect configurations is discussed. In particular, the major compensating defects, such as As antisite (AsGa) and Mn interstitials (MnI), are studied in detail. Thereby, the relationship between structure and magnetic properties is given. It is indicated that a higher annealing temperature can remove MnI out of the GaMnAs lattices so as to raise the Curie temperature TC. Meticulous optimization of growth techniques (TS=230°C, As2:Ga=5:1 and Ta=250°C) leads to reproducible physical properties and ferromagnetic transition temperatures well above 148 K.
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| Keywords:
71.55.Eq
75.50.Pp
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Received: 30 May 2011
Published: 30 August 2011
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