Evidence for electroactive excitation of the spin cycloid in TbMnO3.
Evidence for electroactive excitation of the spin cycloid in TbMnO3.
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DOI：
10.1103/physrevlett.104.097202
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发表时间：
2010-01
影响因子：
8.6
通讯作者：
A. Shuvaev;V. Travkin;V. Ivanov;A. Mukhin;A. Pimenov
中科院分区：
文献类型：
--
作者：
A. Shuvaev;V. Travkin;V. Ivanov;A. Mukhin;A. Pimenov
研究了多铁性TbMnO_3单晶在磁场诱导的自旋摆线旋转过程中的太赫兹电磁激发。除了沿a轴的电磁振子外，对实验光谱的详细极化分析表明，沿晶体c轴的电磁波的交流电场存在电活性激发。这种激发可能是TbMnO_3中自旋摆线的电活性本征模，在磁电耦合的逆Dzyaloshinskii-Moriya机制中已被预言。
Terahertz electromagnetic excitations in the multiferroic TbMnO3 single crystals are investigated across the magnetic field induced rotation of the magnetic spin cycloid. In addition to the electromagnon along the a axis, the detailed polarization analysis of the experimental spectra suggests the existence of an electroactive excitation for ac electric fields of the electromagnetic wave along the crystallographic c axis. This excitation is possibly the electroactive eigenmode of the spin-cycloid in TbMnO3, which has been predicted within the inverse Dzyaloshinskii-Moriya mechanism of magnetoelectric coupling.