| Project/Area Number |
63540242
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性
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| Research Institution | YAMANASHI UNIVERSITY |
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Principal Investigator |
TORIKAI Eiko Yamanashi Univ., Dept. of Engineering, Assoc. Professor, 工学部, 助教授 (20188832)
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| Co-Investigator(Kenkyū-buntansha) |
NAGAMINE Kanetada Univ. of Tokyo, Dept. of Science, Professor, 理学部, 教授 (50010947)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1989: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1988: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | SURFACE MAGNETISM / PARTICLE BEAM / MUON SPIN ROTATION |
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| Research Abstract |
In the beginning of 1989, the government approved a plan to construct a new ultra-slow muon channel in Meson Science Laboratory, University of Tokyo proposed by K. Nagamine, a investigator of the present research project. The new channel is expected to produce high-intensity ultra-slow beam in 1991 with several orders of the magnitude higher than that produced by the conventional facility and will be powerful tool to study the surface magnetism. Considering the future possibilities of the research project, we changed the re- search plan of the final year to concentrate on the development of the high-intensity beam instead to complete the study by using the low intensity beam.
The primary results of the research project are summarized as follows; 1. Development of the High-intensity Ultra-slow Muon Beam (i) The concept and the basic design of the new channel of ultra- slow muon is decided based on the laser-excitation method of the thermal muonium. (ii)Thermal muonium emission from thin SiO_2 layer on a Si(100) wafer into vacuum is observed. The SiO_2 thickness dependence of the yield, which becomes maximum at 3 nm, gives the important in formation about the mechanism of the thermal muonium emission. 2. Magnetism of the Magnetic Monolayers with Multilayered Structure by Muon Spin Relaxation (i) The uSR signal of 2% of Oxygen monolayers adsorbed on Graphite is detected from a huge background of Graphite and it gives the evidence for the magnetic phase transition of 2-D antiferromagnet at 12K. (ii) On artificial metallic superlattice MnSb, the signal/background ratio has been carefully estimated to be more than 20% by the preliminary experiment. The result encourages to perform detail experiments on the subject.
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