Mechanical-force-induced non-local collective ferroelastic switching in epitaxial lead-titanate thin films.

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ID: 34427
2019
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Abstract
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 PbTiO epitaxial thin films by tuning the misfit-strain to be near a phase boundary wherein c/a and a/a nanodomains coexist. Phenomenological models suggest that the collective, c-a-c-a ferroelastic switching arises from the small potential barrier between the degenerate domain structures, and the large anisotropy of a and c domains, 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.
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lu2019mechanicalforceinducednature Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lu, Xiaoyan;Chen, Zuhuang;Cao, Ye;Tang, Yunlong;Xu, Ruijuan;Saremi, Sahar;Zhang, Zhan;You, Lu;Dong, Yongqi;Das, Sujit;Zhang, Hangbo;Zheng, Limei;Wu, Huaping;Lv, Weiming;Xie, Guoqiang;Liu, Xingjun;Li, Jiangyu;Chen, Lang;Chen, Long-Qing;Cao, Wenwu;Martin, Lane W;
Journal Nature communications
Year 2019
DOI
10.1038/s41467-019-11825-2
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