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<p>Ferroelectric films with large and linear strains are crucial for precision microactuator applications, especially at high frequencies. However, existing strategies that rely on frequency- and temperature-dependent dynamics have had limited success in enhancing strain response under such conditions. Here, through promoted local strain fluctuation, we achieve an interlocked polar configuration in spin-coated epitaxial (K,Na)NbO<sub>3</sub>-based ferroelectric films. The films demonstrate high-frequency strains exceeding 1.1% with high linearity and stability even when measured at 10<sup>5</sup> Hz. The presence of interlocked monoclinic and tetragonal polar nanoregions boosts piezoelectric response by promoting polarization dynamics across a broad frequency range. Additionally, the interplay between two distinct polarization switching mechanisms, arising from different symmetries and boundary conditions, mutually compensates, contributing to the observed overall linearity. This approach presents a promising yet facile strategy for achieving ferroelectric films with reliable, large and linear strain across a wide high-frequency range.</p>

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Large linear high-frequency strain by interlocked monoclinic polar nanoregions

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Yue-Yu-Shan Cheng,
  • Xiaoming Shi,
  • Liang Shu,
  • Qingyu He,
  • Yizhe Li,
  • Jin Luo,
  • Sixu Wang,
  • Yi-Xuan Liu,
  • Lisha Liu,
  • Lizhong Wang,
  • Ziqi Yang,
  • Wei Li,
  • Xin Zhang,
  • Liyu Wei,
  • Yongqi Dong,
  • Sarah J. Haigh,
  • David A. Hall,
  • Minlin Zhong,
  • Zhenlin Luo,
  • Qian Li,
  • Houbing Huang,
  • Shujun Zhang,
  • Jing-Feng Li

摘要

Ferroelectric films with large and linear strains are crucial for precision microactuator applications, especially at high frequencies. However, existing strategies that rely on frequency- and temperature-dependent dynamics have had limited success in enhancing strain response under such conditions. Here, through promoted local strain fluctuation, we achieve an interlocked polar configuration in spin-coated epitaxial (K,Na)NbO3-based ferroelectric films. The films demonstrate high-frequency strains exceeding 1.1% with high linearity and stability even when measured at 105 Hz. The presence of interlocked monoclinic and tetragonal polar nanoregions boosts piezoelectric response by promoting polarization dynamics across a broad frequency range. Additionally, the interplay between two distinct polarization switching mechanisms, arising from different symmetries and boundary conditions, mutually compensates, contributing to the observed overall linearity. This approach presents a promising yet facile strategy for achieving ferroelectric films with reliable, large and linear strain across a wide high-frequency range.