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

  • Author(s): 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
  • et al.
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.

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