Observation of coupled magnetic and electric domains
Observation of coupled magnetic and electric domains
复制标题
DOI：
10.1038/nature01077
复制
发表时间：
2002-10-24
期刊：
影响因子：
64.8
通讯作者：
Pisarev, RV
中科院分区：
文献类型：
--
作者：
Fiebig, M;Lottermoser, T;Pisarev, RV
铁电磁是一组有趣的化合物，可以补充纯(反)铁电或(反)铁磁材料--它们同时显示出电和磁的有序(1-3)。通过这种共存，它们补充了可以由电场引起磁化和由磁场引起电极化的材料，这种特性被称为磁电效应(4)。除了基本的重要性外，电磁特性的相互控制对于磁存储介质和自旋电子学的应用也具有重要意义(2，3)。铁电磁体中的电磁耦合有序伴随着磁畴和磁畴壁的形成。然而，到目前为止，还没有观察到磁区和电区之间的这种相互关联。在这里，我们报道了YMnO(3)中反铁磁铁电畴耦合的空间映射，这是通过光学二次谐波成像获得的。这种耦合起源于磁场壁和电场壁之间的相互作用，这导致了一种由序参数的铁电磁乘积主导的位形。
Ferroelectromagnets are an interesting group of compounds that complement purely (anti-)ferroelectric or (anti-)ferromagnetic materials-they display simultaneous electric and magnetic order(1-3). With this coexistence they supplement materials in which magnetization can be induced by an electric field and electrical polarization by a magnetic field, a property which is termed the magnetoelectric effect(4). Aside from its fundamental importance, the mutual control of electric and magnetic properties is of significant interest for applications in magnetic storage media and 'spintronics'(2,3). The coupled electric and magnetic ordering in ferroelectromagnets is accompanied by the formation of domains and domain walls. However, such a cross-correlation between magnetic and electric domains has so far not been observed. Here we report spatial maps of coupled antiferromagnetic and ferroelectric domains in YMnO(3), obtained by imaging with optical second harmonic generation. The coupling originates from an interaction between magnetic and electric domain walls, which leads to a configuration that is dominated by the ferroelectromagnetic product of the order parameters.