EPR detection of presumable magnetoelectric interactions in the liquid-crystalline state of an iron mesogen
EPR detection of presumable magnetoelectric interactions in the liquid-crystalline state of an iron mesogen
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DOI：
10.1016/s0304-8853(03)00635-8
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发表时间：
2004-03-01
影响因子：
2.7
通讯作者：
Konstantinov, VN
中科院分区：
文献类型：
--
作者：
Domracheva, NE;Ovchinnikov, IV;Konstantinov, VN
通过 EPR 研究了类铁电近晶相中含铁介晶分子在磁场中的行为。对 EPR 光谱的角度依赖性的研究允许人们定义铁分子在外部磁场中的异常方向。考虑并评估了影响分子在磁场中取向方式的不同因素。结果表明，异常取向很可能是由内部电场（存在于中间相）通过磁电效应对磁特性的作用引起的。还发现中间相铁络合物的顺磁化率增加，并且在与静态介电常数相同的温度范围内表现出异常。据推测，这种异常现象也与内部电场产生的附加磁化有关。 (C) 2003 Elsevier B.V. 保留所有权利。
The behavior of the iron-containing mesogenic molecules in the magnetic field was studied by EPR in ferroelectric-like smectic phases. The investigation of the angular dependence of the EPR spectra allows one to define the unusual orientation of the iron molecules in the external magnetic field. Different factors influencing the way of the molecules' orientation in the magnetic field were considered and evaluated. It is shown that the unusual orientation is, most probably, caused by the action of the internal electric field (existing in the mesophases) on magnetic properties via the magnetoelectric effect. It is also found that the paramagnetic susceptibility of the iron complex in mesophases is increased, and that it has an anomaly in the same temperature range as the static dielectric permittivity does. It is supposed, that this anomaly is also associated with the creation of an additional magnetization by the internal electric field. (C) 2003 Elsevier B.V. All rights reserved.