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Updated: Apr 21, 2026
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
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Soft memory in a ferroelectric nanoparticle-doped liquid crystal.
1Department of Physics, Soft-matter and Nanomaterials Laboratory, The United States Naval Academy, Annapolis, Maryland 21402, USA.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 30, 2014
Summary
Barium titanate ferroelectric nanoparticles (FNP) in liquid crystals (LC) create a nonvolatile electromechanical memory effect. This effect in the isotropic phase arises from nanoparticle-induced short-range order, showing hysteresis without long-range forces.
Area of Science:
- Materials Science
- Condensed Matter Physics
Background:
- Ferroelectric nanoparticles (FNP) can influence liquid crystal (LC) phase behavior.
- Understanding nonvolatile memory effects in LC-based systems is crucial for device applications.
Purpose of the Study:
- To investigate the electromechanical memory effect in a liquid crystal-ferroelectric nanoparticle hybrid system.
- To elucidate the role of nanoparticle-induced short-range order in the isotropic phase.
Main Methods:
- Doping barium titanate ferroelectric nanoparticles (BaTiO3 FNP) into a liquid crystal (LC) host.
- Characterizing the hybrid system's response to an external electric field in the isotropic phase.
- Analyzing the hysteresis and memory effect using dielectric spectroscopy and optical microscopy.
Main Results:
- The LC + FNP hybrid exhibited a nonvolatile electromechanical memory effect in the isotropic phase.
- Ferroelectric nanoparticles induced short-range pseudonematic domains, enhancing anisotropic behavior without global nematic order.
- A Fréedericksz-type transition was observed, with domains retaining orientation after field removal, demonstrating hysteresis.
Conclusions:
- The observed memory effect is attributed to the anisotropic, nanoparticle-induced short-range order in the isotropic phase.
- The absence of long-range order and restoring forces facilitates the nonvolatile memory and hysteresis.
- Significant pretransitional behavior was noted approaching the nematic phase from the isotropic phase.
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