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

Xiaoyan Lu (), Zuhuang Chen (), Ye Cao, Yunlong Tang, Ruijuan Xu, Sahar Saremi, Zhan Zhang, Lu You, Yongqi Dong, Sujit Das, Hangbo Zhang, Limei Zheng, Huaping Wu, Weiming Lv, Guoqiang Xie, Xingjun Liu, Jiangyu Li, Lang Chen, Long-Qing Chen, Wenwu Cao and Lane W. Martin ()
Additional contact information
Xiaoyan Lu: Harbin Institute of Technology
Zuhuang Chen: Harbin Institute of Technology
Ye Cao: University of Texas at Arlington
Yunlong Tang: University of California
Ruijuan Xu: University of California
Sahar Saremi: University of California
Zhan Zhang: Argonne National Laboratory
Lu You: Nanyang Technological University
Yongqi Dong: Argonne National Laboratory
Sujit Das: University of California
Hangbo Zhang: Harbin Institute of Technology
Limei Zheng: Harbin Institute of Technology
Huaping Wu: Ministry of Education & Zhejiang Province
Weiming Lv: Harbin Institute of Technology
Guoqiang Xie: Harbin Institute of Technology
Xingjun Liu: Harbin Institute of Technology
Jiangyu Li: University of Washington
Lang Chen: Southern University of Science and Technology
Long-Qing Chen: The Pennsylvania State University
Wenwu Cao: Harbin Institute of Technology
Lane W. Martin: University of California

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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 PbTiO3 epitaxial thin films by tuning the misfit-strain to be near a phase boundary wherein c/a and a1/a2 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.

Date: 2019
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DOI: 10.1038/s41467-019-11825-2

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