Room-temperature magnetoelectric effect in a chiral smectic liquid crystal
Room-temperature magnetoelectric effect in a chiral smectic liquid crystal
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DOI：
10.1063/1.5007317
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发表时间：
2017-12
影响因子：
4
通讯作者：
H. Ueda;T. Akita;Y. Uchida;T. Kimura
中科院分区：
文献类型：
--
作者：
H. Ueda;T. Akita;Y. Uchida;T. Kimura
在室温下，在无磁性金属或自由基的手性近晶液晶中观察到一种直接磁电效应，即磁场对电极化的感应。我们对磁电效应和磁介电效应的详细测量表明，液晶中磁电耦合的独特起源，即磁场对分子取向状态的操纵，由于手性诱导的对称性破缺而与局部电偶极矩紧密耦合。这种基于液晶柔软性的非常规策略为实现室温无金属磁电提供了一个有希望的方向。
A direct magnetoelectric effect, an induction of electric polarization by a magnetic field, was observed at room temperature in a chiral smectic liquid crystal without magnetic metals or radicals. Our detailed measurements of the magnetoelectric effect and the magnetodielectric effect suggest a unique origin of the magnetoelectric coupling in the liquid crystal, that is, a magnetic-field manipulation of the molecular orientation state, which is closely coupled with a local electric dipole moment due to the chirality-induced symmetry breaking. This unconventional strategy based on the softness of liquid crystals provides one of the promising directions towards the achievement of room-temperature metal-free magnetoelectrics.