铁电纳米材料和纳米结构研究的进展(英文)

Advances in ferroelectric nanomaterials and nanostructures

铁电纳米材料和纳米结构(如纳米线、纳米管、纳米环)具有新型尺寸效应特性,在铁电基电子器件的微型化方面受到广泛关注。近年来在铁电纳米材料和纳米结构的制备和(电性能和微结构)表征及理论模拟方面取得了相当进展,本文对这方面的最新进展进行评述。首先对高质量的铁电纳米材料和纳米结构的制备方法进行了简短评述,然后介绍铁电纳米材料和纳米结构的纳尺度物性表征。随后介绍了最近发展的四种理论模型(尤其对铁电纳米管、纳米线、纳米点),以及从第一原理出发理论模拟铁电纳米结构的新现象,如铁电纳米结构的自发极化螺旋有序和自发极化涡旋结构。最后总结了铁电纳米材料和纳米结构的微结构研究进展,并讨论了有关铁电纳米结构中自发极化螺旋畴的一些基础物理问题以及实验上寻找自发极化螺旋畴的研究进展。

Ferroelectric nanomaterials and nanostructures such as nanowires, nanotubes and nanorings, have received considerable attention due to their novel size-dependent properties and important applications in the miniaturization of ferroelectric-based electronic devices. In recent years advances have been made both in fabrication and （electrical and structural） characterization of ferroelectric nanomaterials and nanostructures, and also in modeling of the resulting properties. An overview of the state of art in ferroelectric nanomaterials and nanostructures is presented. First, we review the fabrication of high-quality ferroelectric nanomaterials and nanostructures by a variety of techniques. The second deals with nanoscale probing the ferroelectric properties of nanomaterials and nanostructures. The third summarizes the recently developed four theories particularly related to nanotubes, nanowires and nanodots, to deeply understand the novel phenomena such as toroidal ordering of polarization and the polarization vortices in ferroelectric nanostructures from the first-principles computational approach. Finally we describe the enormous progresses made in microstructural characterization of ferroelectric nanomaterials and nanostructures, and some fundamental physics questions regarding both toroidal ordering in ferroelectric nanostructures and attempts on experimental searching for such domain structures in FIB-milled ferroelectric nanostructures cut from single ferroelectric crystals, are also discussed.