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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Correlation between alignment geometries and memory effect in a surface-stabilized ferroelectric liquid crystal.

Suraj Kumar1,2, Lokesh K Gangwar1,2, Ambika Bawa1,2

  • 1Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India.

Physical Review. E
|October 20, 2020
PubMed
Summary

The memory effect in surface stabilized ferroelectric liquid crystals (SSFLC) depends on molecular dynamics and alignment. Antiparallel alignment shows a stronger memory effect due to two distinct molecular dynamics, unlike twisted or unaligned samples.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Ferroelectric liquid crystals (FLCs) exhibit unique memory effects crucial for display technologies.
  • Surface stabilization significantly influences the electro-optical properties of FLCs.
  • Understanding molecular dynamics is key to optimizing FLC device performance.

Purpose of the Study:

  • To investigate the memory effect in weakly aligned surface stabilized ferroelectric liquid crystal (SSFLC) materials.
  • To correlate memory effect duration with molecular dynamics in different alignment configurations.
  • To elucidate the impact of surface and bulk molecular dynamics on SSFLC memory phenomena.

Main Methods:

  • Electro-optical measurements were performed on SSFLC samples.
  • Dielectric spectroscopy was employed to analyze molecular dynamics.
  • Three alignment configurations were studied: antiparallel, 90° twisted, and unaligned planar.

Main Results:

  • Antiparallel alignment exhibited a longer memory effect, attributed to two distinct molecular dynamics (surface and bulk).
  • Twisted and unaligned samples showed shorter memory effects, with a single observed dielectric process.
  • Unaligned samples with cell thickness below the pitch value displayed no memory effect.

Conclusions:

  • The memory effect in SSFLCs is strongly dependent on the interplay between molecular dynamics and alignment geometry.
  • Distinct surface and bulk molecular dynamics in antiparallel alignment enhance the memory phenomenon.
  • This research provides insights into anomalies in SSFLC memory effects across various configurations, aiding in material optimization.