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Cr-Doped InAs Self-Organized Diluted Magnetic Quantum Dots ith Room-Temperature Ferromagnetism |
| ZHENG Yu-Hong;ZHAO Jian-Hua;BI Jing-Feng;WANG Wei-Zhu;JI Yang;WU Xiao-Guang;XIA Jian-Bai |
| State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083 |
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| Cite this article: |
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ZHENG Yu-Hong, ZHAO Jian-Hua, BI Jing-Feng et al 2007 Chin. Phys. Lett. 24 2118-2121 |
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Abstract Cr-doped InAs self-organized diluted magnetic quantum dots (QDs) are grown by low-temperature molecular-beam epitaxy. Magnetic measurements reveal that the Curie temperature of all the InAs:Cr QDs layers with Cr/In flux ratio changing from 0.026 to 0.18 is beyond 400K. High-resolution cross sectional transmission electron microscopy images indicate that InAs:Cr QDs are of the zincblende structure. Possible origins responsible for the high Curie temperature are discussed.
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| Keywords:
81.05.Zx
75.50.Pp
81.15.Hi
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Received: 08 March 2007
Published: 25 June 2007
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| PACS: |
81.05.Zx
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(New materials: theory, design, and fabrication)
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75.50.Pp
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(Magnetic semiconductors)
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81.15.Hi
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(Molecular, atomic, ion, and chemical beam epitaxy)
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