2011 Fiscal Year Final Research Report
Control of self-organized formation of magnetic element-rich nanowires in semiconductors and its device application
| Project/Area Number |
21310070
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nanomaterials/Nanobioscience
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| Research Institution | University of Tsukuba |
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Principal Investigator |
KURODA Shinji 筑波大学, 数理物質系, 教授 (40221949)
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| Project Period (FY) |
2009 – 2011
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| Keywords | スピントロニクス |
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| Research Abstract |
As an example of the aggregation of a magnetic element in semiconductors, we have studied the aggregation of Cr in a II-VI magnetic semiconductor (Zn, Cr)Te. We have grown thin films of (Zn, Cr)Te doped with a donor impurity iodine (I) by molecular beam epitaxy (MBE) and have investigated how the Cr aggregation depends on the growth conditions by performing structural analyses using transmission electron microscope (TEM) and x-ray diffraction (XRD) on a series of samples grown under a systematic variation of the MBE growth conditions. As a result, we have found that the Cr aggregation changes depending on the average Cr composition in the crystal and the growth temperature. In particular, for a high average Cr composition, Cr atoms aggregate into precipitates of Cr_<1-δ>Te nanocrystals of hexagonal structure and the amount of the precipitation increases with the growth temperature.
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[Journal Article] Effect of co-doping of donor and acceptor impurities in the ferromagnetic semiconductor Zn_<1-χ>Cr_χTe studied by softx-ray magnetic circular dichroism2011
Author(s)
Y. Yamazaki, T. Kataoka, V. R. Singh, A. Fujimori, F.-H. Chang, D.-J. Huang, H.-J. Lin, C. T. Chen, K. Ishikawa, K. Zhang, S. Kuroda
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Journal Title
Journal of Physics : Condensed Matter
Volume: 23
Pages: 1-4
DOI
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[Journal Article] Reversible ferromagnetic spin ordering governed by hydrogen in Co-doped ZnO semiconductor2009
Author(s)
Y. C. Cho, S. J. Kim, S. Lee, S. J. Kim, C. R. Cho, H. H. Nahm, C. H. Park, I. K. Jeong, S.Park, T. E. Hogn, S. Kuroda, S. Y. Jeong
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Journal Title
Applied Physics Letters
Volume: 95
Pages: 1-3
DOI
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[Presentation] Effect of co-doping of donor and acceptor impurities in the ferromagnetic semiconductor Zn_<1-χ>Cr_χTe studied by softx-ray magnetic circular dichroism2010
Author(s)
Y. Yamazaki, T. Kataoka, V. R. Singh, A. Fujimori, F.-H. Chang, H.-J. Lin, D. J. Huang, C. T. Chen, K. Ishikawa, K. Zhang, S. Kuroda
Organizer
第15回半導体スピン工学の基礎と応用(PASPS-15)
Place of Presentation
筑波大学
Year and Date
2010-12-20
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