2013 Fiscal Year Final Research Report
Novel magnetoelectric effect and electromagnon
| Project/Area Number |
24740224
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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
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SODA Minoru 東京大学, 物性研究所, 助教 (40463905)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | マルチフェロイック / リラクサー磁性体 / スピン・ネマティック / 超常磁性 / 電気磁気効果 |
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| Research Abstract |
Spin nematic interaction has been found in an easy-plane type antiferromagnet Ba2CoGe2O7 by measuring the magnetic anisotropy and spin dynamics. In this system, the spin nematic operator is equivalent to the polarization. The in-plane anisotropy is induced by an antiferro-type interaction of the spin nematic operator.
In our elastic neutron study of relaxor magnet LuFeCoO4, the strong coupling between the nuclear and magnetic correlations has been found. The observed magnetization with superparamagnetic component can be explained by ``multiferroic nano region'' (MNR) model; the polar nano-regions (PNRs) and superparamagnetic domains grow simultaneously.
These results show the possibility of new type of magnetoelectric effect.
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