Mechanical-force-induced non-local collective ferroelastic switching in epitaxial lead-titanate thin films
Mechanical-force-induced non-local collective ferroelastic switching in epitaxial lead-titanate thin films
复制标题
外延钛酸铅薄膜中机械力诱导的非局部集体铁弹性转换
DOI：
10.1038/s41467-019-11825-2
复制
发表时间：
2019-09-02
影响因子：
16.6
通讯作者：
Martin, Lane W.
中科院分区：
文献类型：
--
作者：
Lu, Xiaoyan;Chen, Zuhuang;Martin, Lane W.
铁电/多铁氧化物中的铁弹性切换在确定其介电、压电和磁电特性方面起着至关重要的作用。然而，在这些材料的薄膜中，衬底夹紧通常被认为将电场或机械力驱动的响应限制在局部尺度。在这里，我们通过将错配应变调整到 c/aanda1/a2 纳米域共存的相界附近，报告了 PbTiO3 外延薄膜中机械力诱导的大面积、非局部、集体铁弹性域转换。现象学模型表明，集体的c-a-c-铁弹性切换是由简并域结构之间的小势垒以及a和c域的大各向异性引起的，它们共同产生更大的响应和大面积域传播。与传统的对外场局部响应不同，小刺激下的大面积非局部响应提供了对局部刺激进行独特响应的机会，这在高灵敏度压力传感器和开关中具有应用潜力。
Ferroelastic switching in ferroelectric/multiferroic oxides plays a crucial role in determining their dielectric, piezoelectric, and magnetoelectric properties. In thin films of these materials, however, substrate clamping is generally thought to limit the electric-field- or mechanical-force-driven responses to the local scale. Here, we report mechanical-force-induced large-area, non-local, collective ferroelastic domain switching in PbTiO3epitaxial thin films by tuning the misfit-strain to be near a phase boundary whereinc/aanda1/a2nanodomains coexist. Phenomenological models suggest that the collective,c-a-c-aferroelastic switching arises from the small potential barrier between the degenerate domain structures, and the large anisotropy ofaandcdomains, which collectively generates much larger response and large-area domain propagation. Large-area, non-local response under small stimuli, unlike traditional local response to external field, provides an opportunity of unique response to local stimuli, which has potential for use in high-sensitivity pressure sensors and switches.