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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
Giant flexoelectric effect in ferroelectric epitaxial thin films
1ReCFI, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
Physical Review Letters
|August 27, 2011
Summary
We discovered giant flexoelectric effects in ferroelectric thin films due to nanoscale strain gradients. This flexoelectricity allows tuning of ferroelectric properties like domain configurations and hysteresis curves.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Ferroelectric materials exhibit spontaneous electric polarization.
- Epitaxial thin films offer unique properties compared to bulk materials.
- Flexoelectricity describes the strain-induced polarization in dielectrics.
Purpose of the Study:
- To investigate nanoscale strain gradients in ferroelectric HoMnO(3) epitaxial thin films.
- To quantify the resulting flexoelectric effect.
- To explore the tunability of ferroelectric properties via flexoelectricity.
Main Methods:
- Grazing-incidence in-plane x-ray diffraction for strain gradient measurement.
- Transmission electron microscopy for structural analysis.
- Electrical measurements and electrostatic calculations for property evaluation.
Main Results:
- Observed strain gradients 6-7 orders of magnitude larger than in bulk oxides.
- Demonstrated a giant flexoelectric effect in HoMnO(3) films.
- Confirmed flexoelectricity's role in tuning domain configurations and hysteresis.
Conclusions:
- Nanoscale strain gradients in ferroelectric thin films induce significant flexoelectric effects.
- Flexoelectricity is a viable mechanism for controlling ferroelectric thin film properties.
- This finding opens avenues for novel device applications in ferroelectric nanotechnology.
