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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Ferroelectric switching in ferroelastic materials with rough surfaces.

Guangming Lu1,2, Suzhi Li3, Xiangdong Ding4

  • 1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China.

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|November 3, 2019
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Summary

Non-polar ferroelastic crystals exhibit electric switching via polar domain walls, driven by surface steps. This research demonstrates an electrically induced ferroelectric hysteresis loop in a non-ferroelectric material.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Ferroelastic materials exhibit spontaneous strain but are typically non-polar.
  • Electric field control of domain structures is crucial for advanced electronic devices.

Purpose of the Study:

  • To investigate the mechanism of electric switching in non-polar ferroelastic materials.
  • To demonstrate the possibility of inducing ferroelectric behavior in non-ferroelectric ferroelastic materials.

Main Methods:

  • Utilizing atomic force microscopy to observe domain nucleation and growth.
  • Applying electric fields to induce domain switching in ferroelastic crystals.
  • Analyzing the role of surface topography and domain wall polarity.

Main Results:

  • Domain switching in non-polar ferroelastic crystals is initiated at rough surfaces with atomic steps.
  • Polar domain walls emerge from surface nuclei, enabling electric field-driven domain progression.
  • Smooth surfaces with high activation barriers inhibit domain nucleation.
  • An electrically driven ferroelectric hysteresis loop was observed in a non-ferroelectric, ferroelastic bulk material.

Conclusions:

  • Surface morphology and domain wall polarity are critical for electric switching in ferroelastic materials.
  • Ferroelastic materials can exhibit electrically switchable behavior, opening avenues for novel electronic applications.