| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Structure and Magnetic Properties of (In,Mn)As Based Core-Shell Nanowires Grown on Si(111) by Molecular-Beam Epitaxy |
| PAN Dong1, WANG Si-Liang1,2**, WANG Hai-Long1, YU Xue-Zhe1, WANG Xiao-Lei1, ZHAO Jian-Hua1** |
1State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083
2Central Research Academy of Dongfang Electric Corporation, Chengdu 611731
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| Cite this article: |
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PAN Dong, WANG Si-Liang, WANG Hai-Long et al 2014 Chin. Phys. Lett. 31 078103 |
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Abstract We report the structure and magnetic properties of (In,Mn)As based core-shell nanowires grown on Si (111) by molecular-beam epitaxy. Compared to the core InAs nanowire with a flat side facet and consistent diameter, the core-shell nanowire shows a rough sidewall and an inverse tapered geometry. X-ray diffraction, transmission electron microscopy and energy-dispersive x-ray spectroscopy show that (In,Mn)As is formed on the side facets of InAs nanowires with a mixture of wurtzite and zinc-blende structures. Two ferromagnetic transition temperatures of (In,Mn)As from magnetic measurement data are observed: one is less than 25 K, which could be attributed to the magnetic phase with diluted Mn atoms in the InAs matrix, and the other is at ～300 K, which may originate from the undetectable secondary phases such as MnAs nanoclusters. The synthesis of (In,Mn)As based core-shell nanowires provides valuable information to exploit a new type of spintronic nano-materials.
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Published: 30 June 2014
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| PACS: |
81.07.Gf
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(Nanowires)
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62.23.St
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(Complex nanostructures, including patterned or assembled structures)
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75.50.Pp
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(Magnetic semiconductors)
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75.75.Cd
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(Fabrication of magnetic nanostructures)
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81.15.Hi
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(Molecular, atomic, ion, and chemical beam epitaxy)
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