Magnetic control of ferroelectric polarization
Magnetic control of ferroelectric polarization
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DOI：
10.1038/nature02018
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发表时间：
2003-11-06
期刊：
影响因子：
64.8
通讯作者：
Tokura, Y
中科院分区：
文献类型：
--
作者：
Kimura, T;Goto, T;Tokura, Y
磁电效应-通过电场感应磁化和通过磁场感应极化-首先由皮埃尔·居里假设存在（1），随后在20世纪60年代和70年代引起了极大的兴趣（参考文献2 - 4）。最近，对磁性铁电体的相关研究（5-14）表明对这种现象的兴趣正在复苏。从技术的角度来看，电和磁特性的相互控制是一种有吸引力的可能性（15），但候选材料的数量有限，并且效果通常太小而无法在应用中使用。在这里，我们报告发现铁电性的钙钛矿锰氧化物，TbMnO 3，自旋挫折的影响，导致正弦反铁磁秩序。调制的磁结构伴随着磁弹性诱导的晶格调制，并伴随着自发极化的出现。在磁性铁电体TbMnO_3中，我们发现了巨大的磁电和磁电容效应，这可以归因于磁场诱导的电极化的切换。因此，阻挫自旋系统提供了一个新的领域，以寻找磁电介质。
The magnetoelectric effect - the induction of magnetization by means of an electric field and induction of polarization by means of a magnetic field - was first presumed to exist by Pierre Curie(1), and subsequently attracted a great deal of interest in the 1960s and 1970s ( refs 2 - 4). More recently, related studies on magnetic ferroelectrics(5-14) have signalled a revival of interest in this phenomenon. From a technological point of view, the mutual control of electric and magnetic properties is an attractive possibility(15), but the number of candidate materials is limited and the effects are typically too small to be useful in applications. Here we report the discovery of ferroelectricity in a perovskite manganite, TbMnO3, where the effect of spin frustration causes sinusoidal antiferromagnetic ordering. The modulated magnetic structure is accompanied by a magnetoelastically induced lattice modulation, and with the emergence of a spontaneous polarization. In the magnetic ferroelectric TbMnO3, we found gigantic magnetoelectric and magnetocapacitance effects, which can be attributed to switching of the electric polarization induced by magnetic fields. Frustrated spin systems therefore provide a new area to search for magnetoelectric media.