| Project/Area Number |
20540332
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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 |
Condensed matter physics II
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
ASAI Kichizo 電気通信大学, 大学院・情報理工学研究科, 教授 (00109795)
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| Co-Investigator(Kenkyū-buntansha) |
ABE Kouji 電気通信大学, 大学院・情報理工学研究科, 教授 (20183139)
NAKAMURA Jin 電気通信大学, 大学院・情報理工学研究科, 准教授 (50313416)
KOBAYASHI Yoshihiko 東京医科大学, 医学部, 講師 (60293122)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2008: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 磁気緩和 / 誘電緩和 / デバイ緩和 / 酸素欠損 / 磁気余効 / ^<57> Fe NMR / 電気磁気効果 / マルチフェロイック / マルチフェッロイック / YIG / NMR / 鉄ガーネット / 誘電損失 / 磁器緩和 / TSEZ / TSFZ / 酸素欠陥 |
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| Research Abstract |
The present study aims to elucidate the anomalous magneto-electric effect in yttrium iron garnet(YIG). The Debye-type magnetic and electric relaxations observed below 300 K both arise from Fe2+ accompanied by oxygen vacancies in YIG. It has been found that the charge transfer among 16a sites persists down to 4 K resulting in the valence fluctuation between Fe2+ and Fe3+. A correlation between the magnetic anisotropy and the electric polarization arising from Fe2+ in 16a sites is suggested to be the origin of the anomalous magneto-electric effect in YIG.
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