| Project/Area Number |
09555021
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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 | 展開研究 |
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| Research Field |
Applied physics, general
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| Research Institution | Nagoya University |
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Principal Investigator |
TANJI Takayoshi Nagoya University, Center for Integrated Research in Science and Engineering, Associate Professor, 理工科学総合研究センター, 助教授 (90125609)
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| Co-Investigator(Kenkyū-buntansha) |
TOMITA Masahiro Hitachi, Ltd., Senior Engineer, 計測器グループ, 主任技師
HIRAYAMA Tsukasa Japan Fine Ceramics Center, Chief Researcher, 主幹主任研究員
HANAI Takaaki School of Engineering, Assistant Professor, 工学研究科, 講師 (00156366)
木村 啓子 名古屋大学, 理工科学総合研究センター, 助手 (60262862)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥11,200,000 (Direct Cost: ¥11,200,000)
Fiscal Year 1999: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1998: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1997: ¥6,800,000 (Direct Cost: ¥6,800,000)
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| Keywords | electron holography / differential interferometry / differential microscopy / electron trapezoidal prism / real time phase observation / 電子系台形プリズム |
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| Research Abstract |
Electron holography, which enables us to measure the electron phase shift with high precise and high resolution, requires a well-defined reference wave. This restricts the application to materials science. The theme of this research is to develop a new electron differential microscopy to overcome this disadvantage of electron holography and a system which makes a real time observation possible.
Following results have been obtained in this project :
i) In order to compensate for the lack of sensitivity in differential interferometry for weak phase objects, we proposed electron phase differential micrography that is realized by means of digital reconstruction method. For convenience an electron trapezoidal prism has been invented and replaced electron biprism.
ii) We successfully observed directly the magnetic vectors in ferromagnetic thin films and that leaking from single magnetic domain particles by the two dimensional differentiation. It has been found that the reference phase reconstructed from all holograms should be coincident to each other, and an effect of Fresnel diffraction at an electron prism is important, too.
iii) A complete simulation of electron holograms which include Fresnel effects, the quantum noise and the coherency of electrons has been accomplished.
iv) Applying an additional square-wave voltage to the electron trapezoidal prism and recording double-exposure holograms on videotape, we confirmed that the real time observation in electron differential interferometry is available, though the time resolution obtained is about 1 sec. so far.
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