Zernike Institute for Advanced Materials, Solid State Materials for Electronics, University of Groningen, 9747 AG Groningen, The Netherlands.
Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, Tennesee 37831, USA.
Nat Commun. 2014 Jul 14;5:4415. doi: 10.1038/ncomms5415.
With shrinking device sizes, controlling domain formation in nanoferroelectrics becomes crucial. Periodic nanodomains that self-organize into so-called 'superdomains' have been recently observed, mainly at crystal edges or in laterally confined nanoobjects. Here we show that in extended, strain-engineered thin films, superdomains with purely in-plane polarization form to mimic the single-domain ground state, a new insight that allows a priori design of these hierarchical domain architectures. Importantly, superdomains behave like strain-neutral entities whose resultant polarization can be reversibly switched by 90°, offering promising perspectives for novel device geometries.
随着器件尺寸的缩小，控制纳米铁电体中的畴结构变得至关重要。最近观察到周期性纳米畴会自组织成所谓的“超畴”，主要出现在晶体边缘或横向受限的纳米物体中。在这里，我们表明在扩展的、应变工程化的薄膜中，具有纯面内极化的超畴形成以模拟单畴基态，这一新的见解允许对这些分层畴结构进行预先设计。重要的是，超畴表现为应变中性实体，其结果极化可以可逆地切换 90°，为新型器件几何形状提供了有前景的视角。
