2015 Fiscal Year Final Research Report
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 |
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| Research Field |
Condensed matter physics II
Condensed matter physics I
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| Research Institution | Aoyama Gakuin University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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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 |
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| 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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| Free Research Field |
固体物理
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