Nahas Y, Prokhorenko S, Louis L, Gui Z, Kornev I, Bellaiche L
Physics Department and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, Arkansas 72701, USA.
Department of Materials Science &Engineering and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA.
Nat Commun. 2015 Oct 5;6:8542. doi: 10.1038/ncomms9542.
Non-coplanar swirling field textures, or skyrmions, are now widely recognized as objects of both fundamental interest and technological relevance. So far, skyrmions were amply investigated in magnets, where due to the presence of chiral interactions, these topological objects were found to be intrinsically stabilized. Ferroelectrics on the other hand, lacking such chiral interactions, were somewhat left aside in this quest. Here we demonstrate, via the use of a first-principles-based framework, that skyrmionic configuration of polarization can be extrinsically stabilized in ferroelectric nanocomposites. The interplay between the considered confined geometry and the dipolar interaction underlying the ferroelectric phase instability induces skyrmionic configurations. The topological structure of the obtained electrical skyrmion can be mapped onto the topology of domain-wall junctions. Furthermore, the stabilized electrical skyrmion can be as small as a few nanometers, thus revealing prospective skyrmion-based applications of ferroelectric nanocomposites.
非共面涡旋场纹理，即斯格明子，如今已被广泛视为既具有基本研究意义又具有技术相关性的对象。到目前为止，斯格明子在磁体中得到了充分研究，在磁体中，由于手性相互作用的存在，这些拓扑对象被发现具有内在稳定性。另一方面，由于缺乏这种手性相互作用，铁电体在这方面的研究有所滞后。在此，我们通过使用基于第一性原理的框架证明，极化的斯格明子构型可以在外加电场的作用下在铁电纳米复合材料中实现稳定。所考虑的受限几何结构与铁电相不稳定性背后的偶极相互作用之间的相互作用诱导了斯格明子构型。所获得的电斯格明子的拓扑结构可以映射到畴壁结的拓扑结构上。此外，稳定的电斯格明子可以小至几纳米，从而揭示了铁电纳米复合材料基于斯格明子的潜在应用前景。
Zotero 插件
