Magnetic field effect on the thresholds of a sequence of transitions in the electroconvection of a homeotropic nematic liquid crystal.

Phys Rev E Stat Nonlin Soft Matter Phys 2002 Sep 23;66(3 Pt 2A):036213. Epub 2002 Sep 23.

Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, Budapest, P.O.B. 49, H-1525 Hungary.

We present a detailed analysis of the characteristics of electroconvection patterns in a homeotropic nematic liquid crystal under the influence of a variable magnetic field. An unambiguous observation of low frequency "reentrant" normal rolls and a nonmonotonic magnetic field dependence of the threshold voltages is reported. The effect of the magnetic field on the normal roll-abnormal roll transition is determined, which is in good agreement with theoretical predictions of the weakly nonlinear analysis.

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http://dx.doi.org/10.1103/PhysRevE.66.036213DOI Listing
September 2002
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