| Project/Area Number |
15K05184
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Sophia University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
AKAHOSHI Daisuke 東邦大学, 理学部, 准教授 (90407354)
AKAKI Mitsuru 大阪大学, 大学院理学研究科, 助教 (60610904)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | マルチフェロイック物質 / 誘電体 / スピン / 電気分極ドメイン / 酸化物 / 相転移 / 磁場 / 電気磁気効果 / 極性結晶 |
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| Outline of Final Research Achievements |
We have investigated change of electric domains in high-quality BiFeO3 single crystal grown by the laser-diode floating-zone method, as a function of applied magnetic-field (H) direction. We have demonstrated that electric polarization along the Y direction (PY) has been controlled by means of rotating H. Namely, PY was proportional to cos2q, where q is the angle of applied H direction against [100]. q dependence of PY has a π-periodicity, which means that PY remains unchanged by reversal of applied H direction. Furthermore, we have studied nonreciprocal DC magnetoelectric response, i.e., crystalline (polar) direction dependence of magnetoelectric susceptibilities for CaBaM4O7 (M=Co,Fe) single crystals. Especially, we focused on the electric-field (Ec)-induced magnetization (Mb,Mc) in CaBaM4O7, which had almost not yet been performed. We have found that the obtained magnetoelectric susceptibility α32 defined as ΔMb=α32Ec has a different sign depending on the polar direction.
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