| Project/Area Number |
23655198
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | スーパースピングラス / スピングラス / 磁性体 / 酸化物 / 階層構造 / 超微粒子 / アモルファス / 薄膜 / ファラデー効果 / 記録材料 |
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| Research Abstract |
Fundamentals of magnetism have been clarified for super-spin glass with hierarchical structure and amorphous oxide magnets which are prototype of random magnetic systems. For the former, an assemblage state of mesoporous silica microparticles with maghemite nanocrystals precipitated in the mesopores has been fabricated. The Faraday effect measurements reveal that the material show superparamagnetism at room temperature. As for the amorphous oxide magnets, oxide glasses containing both iron and rare-earth elements exhibit spin glass or super-spin glass transition, while amorphous EuZrO_3thin film shows re-entrant spin glass transition accompanied by ferromagnetic transition. The mechanism of these magnetic phase transitions have been elucidated.
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