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Electrohydrodynamic Instability in Cholesteric Liquid Crystals in the Presence of a Magnetic Field

We report electrohydrodynamic instability in a cholesteric liquid crystal—a mixture of p-methoxy benzylidene p-n-butylaniline (MBBA) and a cholesteric dopant cholesteryl nonanoate (CN), in the presence of a superimposed magnetic field H. We have found a certain intensity H* with respect to the instability in this mixture with negative dielectric anisotropy, beyond which a stripe pattern appears. With an increasing electric field, the stripe pattern evolves into a grid pattern (GP). Investigations of the H-dependences of thresholds and wavelengths for these patterns in comparison with those of nematic liquid crystals clearly show that the typical GPs found in cholesteric liquid crystals are a superposition of two kinds of stripe patterns induced by the electrohydrodynamic instability.