| Project/Area Number |
10650692
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Hiroshima University |
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Principal Investigator |
TSUTAOKA Takanori Faculty of School Education, Hiroshima University, Associate Professor, 学校教育学部, 助教授 (10231432)
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| Co-Investigator(Kenkyū-buntansha) |
古賀 信吉 広島大学, 学校教育学部, 助教授 (30240873)
TSUTAOKA Takanori Faculty of School Education, Hiroshima University, Associate Professor (10231432)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1998: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Ferrite / Composite Materials / Parametric Amplification / Complex Permeability / Non-Linear permeability / Ferrite Antenna |
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| Research Abstract |
Investigations for high frequency non-linear permeability of Mn-Zn ferrte, Ni-Zn ferrtei and their composite materials have been carried out. Magnetic field effect to them were also studied.
Results are as follows,
(1) In Mn-Zn ferrite, resonance type frequency dispersion of complex permeability due to domain wall vibration has been observed in the frequency above seceral 100kHz. Dispersion type change to relaxation in sintered ferrite due to the decrease of magnetic domain walls. In composite materials, permeability dispersion occurs over 100MHz. Dispersion character changes by application of external magnetic field in resonance region.
(2) In Ni-Zn ferrite, relaxation type natural resonance has been observed above several MHz in sintered body. In composite materials, frequency dispersion shifts toward up to several GHz due to demagnetizing field in particles.
(3) Parametric amplification of electromagnetic wave up to 1GHz was studied by the strip line configuration in which two strip lines were connected by sintered Ni-Zn ferrite. Transmission of electromagnetic wave can be controlled by the external field in resonance region, but amplification could not achieved. Thus new configuration, which combine two resonator connected each other by ferrite, were introduced.
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