Single-phase magnetoelectric multiferroics are ferroelectric materials that display some form of magnetism. In addition, magnetic and ferroelectric order parameters are not independent of one another. Thus, the application of either an electric or magnetic field simultaneously alters both the electrical dipole configuration and the magnetic state of the material. The technological possibilities that could arise from magnetoelectric multiferroics are considerable and a range of functional devices has already been envisioned. Realising these devices, however, requires coupling effects to be significant and to occur at room temperature. Although such characteristics can be created in piezoelectric-magnetostrictive composites, to date they have only been weakly evident in single-phase multiferroics. Here in a newly discovered room temperature multiferroic, we demonstrate significant room temperature coupling by monitoring changes in ferroelectric domain patterns induced by magnetic fields. An order of magnitude estimate of the effective coupling coefficient suggests a value of ~1 × 10−7 sm−1.
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机译：单相磁电多铁是显示某种形式的磁性的铁电材料。另外，磁和铁电有序参数不是彼此独立的。因此，电场或磁场的施加同时改变了材料的电偶极配置和磁状态。磁电多重铁可能产生的技术可能性是巨大的，并且已经设想了一系列功能器件。然而，实现这些装置要求耦合效应显着并在室温下发生。尽管可以在压电-磁致伸缩复合材料中产生这样的特性，但迄今为止，它们在单相多铁性材料中仅是微弱的。在这里，在一个新发现的室温多铁性介质中，我们通过监视磁场引起的铁电畴模式的变化，证明了显着的室温耦合。有效耦合系数的数量级估计表明值为〜1×10 −7 sm −1 。
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