Theoretical study on intense-excitation effects and optical functions of electromagnons in multiferroic materials
Project/Area Number |
25870169
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Condensed matter physics II
Condensed matter physics I
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Research Institution | Aoyama Gakuin University |
Principal Investigator |
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Project Period (FY) |
2013-04-01 – 2016-03-31
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Project Status |
Completed (Fiscal Year 2015)
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Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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Keywords | 磁性強誘電体 / エレクトロマグノン / 電気磁気結合 / マルチフェロイックス / キラル磁性体 / 非相反方向二色性 / 磁気カイラル効果 / スキルミオン / 磁気スキルミオン / カイラル磁性体 / マイクロ波素子 |
Outline of Final Research Achievements |
I have theoretically predicted that interference of two activation channels inherent to electromagnon excitations in insulating chiral magnet Cu2OSeO3 leads to gigantic microwave directional dichroism, and have confirmed this prediction by a collaboration with experimental groups. I have also theoretically demonstrated that skyrmions can be created by applying electric fields on a thin-film sample of Cu2OSeO3 via an electrode tip, which is achieved by electric-field-driven local magnetization flop through magnetoelectric coupling in this multiferroic system. In addition, I have discovered a new insulating skyrmionic material GaV4S8, and have uncovered that skyrmions in this material are Neel-type one, which has not been discovered in any real material so far. We also theoretically revealed a microscopic mechanism of magnetic-field induced 90-degree flop of ferroelectric polarization in spin-spiral multiferroics TbMnO3, and have shown that this phenomenon occurs in a deterministic way.
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Report
(4 results)
Research Products
(49 results)
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[Journal Article] Neel-type skyrmion lattice with confined orientation in the polar magnetic semiconductor GaV4S82015
Author(s)
I. Kezsmarki, S. Bordács, P. Milde, E. Neuber, L. M. Eng, J. S. White, H. M. Ronnow, C. D. Dewhurst, M. Mochizuki, K. Yanai, H. Nakamura, D. Ehlers, V. Tsurkan, A. Loidl
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Journal Title
Nature Materials
Volume: 14
Issue: 11
Pages: 1116-1122
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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