Simple model for the polarization reversal current in a ferroelectric liquid crystal

Dahl, Ingolf; Lagerwall, S. T.; Skarp, Kent

doi:10.1103/physreva.36.4380

Cited by 67 publications

(32 citation statements)

References 11 publications

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“…The £ tensor does not describe the effective permittivity of the ferroelectric material rather then is related to the polarization which will be induced without spontaneous polarization of the compound but exhibiting the same dielectric properties (ct. Dahl et al 20 ). The most important contribution to the P, E interaction results from the uniform sections (tv and bv in Figure 7) in which the polarization is directed uniformly and optimal to the electric field.…”

Section: Modelling the Coupled Director And Layer Reorientationmentioning

confidence: 96%

Coupled Director and Layer Reorientation in Layer Tilted Ferroelectric Smectic Liquid Crystal Cells

Gießelmann

Zugenmaier

1993

Molecular Crystals and Liquid Crystals Science and Technology.

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A reversible reo rientation of smectic laye rs in surface stabilized ferroelectri c liquid crystal (SSFLC) cells with layer tilted (chevron) geometries was found by electrooptical investigations. The reorientation of the layers superimposes the reorientation of the director along the S'; tilt cone a nd is suppressed. if the layers are irreversibly fixed in a bookself geometry by high electric fie lds.Based o n a potential density expansion, a dynamical model of a coupl~d director and layer reorientation is proposed, which leads to excellent agreeme nt with the electrooptical behaviour of the system investigated . The fit of the model to experimental data supplies a simultaneous determination of several material and cell constants. Basic e lcctrooptical parameters, as contrast, switching times and optical overshoot, are reproduced correctly.

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Section: Modelling the Coupled Director And Layer Reorientationmentioning

confidence: 96%

Coupled Director and Layer Reorientation in Layer Tilted Ferroelectric Smectic Liquid Crystal Cells

Gießelmann

Zugenmaier

1993

Molecular Crystals and Liquid Crystals Science and Technology.

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“…where µ 0 is the permeability, χ lab 20 is the 0 component of the second-order irreducible spherical magnetic susceptibility tensor in the laboratory frame and the constant K is closely related to the elastic constants of the system [16]. The first term in equation (6) is the usual representation of the magnetic energy.…”

Section: Smectic C Modelmentioning

confidence: 99%

“…It should reflect the "anchoring" of the molecules along a particular direction n γ . For the sake of simplicity, we considered that this term has an angular dependence similar to the one introduced for the S * C in the SSFLC cells to model the dynamics of the electric field induced molecular switching [16].…”

Section: Smectic C Modelmentioning

confidence: 99%

Molecular order in bilayer, anticlinic and ferroelectric smectic C mesophases

Carvalho¹,

Sebastião²,

Ferraz³

et al. 2000

Eur. Phys. J. E

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In this work we present a proton NMR comparative study of the molecular order in the smectic C2 (SC2), smectic C * (S * C ) and anticlinic smectic C phases (S * CA and S C? ) of two liquid crystalline compounds. The second moments of the experimental proton NMR spectra are well explained taking into account two different molecular orientations models. From the analysis of our experimental results it was possible to estimate the tilt angles for all the smectic C phases studied in this work.PACS. 61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order -76.60.-k Nuclear magnetic resonance and relaxation

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“…Similar equations for switching in a electric field have been solved by Dahl et al [8]. Assuming full analogy between electric and magnetic phenomena it is easy to obtain the following expression: …”

Section: Fflc In External Fieldsmentioning

confidence: 93%

Some Conditions of Ferromagnetic Liquid Crystal Existence

Buivydas

1991

Physica Status Solidi (b)

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The possibility of the existence of the ferromagnetic liquid crystal based on analogy between electric and magnetic phenomena is considered. Nematic and smectic liquid crystalline states and symmetry conditions are discussed. The most common case -hypothetical fcrromagnetic-ferroelectric liquid crystal (FFLC) and some of the field effects on it are described based on Landau free energy expression.

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Simple model for the polarization reversal current in a ferroelectric liquid crystal

Cited by 67 publications

References 11 publications

Coupled Director and Layer Reorientation in Layer Tilted Ferroelectric Smectic Liquid Crystal Cells

Coupled Director and Layer Reorientation in Layer Tilted Ferroelectric Smectic Liquid Crystal Cells

Molecular order in bilayer, anticlinic and ferroelectric smectic C mesophases

Some Conditions of Ferromagnetic Liquid Crystal Existence

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