We report measurements and theoretical predictions on the effect of an aligning magnetic field on the orientational disorder of a nematic liquid crystal in contact with isotropic solid substrates. Different types of substrates present a similar disorder and a similar dependency on the magnetic field amplitude, i.e. a decreasing of the angular distribution widths and spatial correlation lengths. Measurements are in qualitative agreement with a theory where the orientational disorder emerges from the competition between the aligning magnetic torque and the disorienting thermal fluctuations during the adsorption of the liquid crystal molecules on the substrate.

中文翻译：

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磁场下向列液晶的猝灭失调

我们报告了对准磁场对与各向同性固体基质接触的向列液晶取向紊乱的影响的测量结果和理论预测。不同类型的基板表现出相似的无序性和对磁场振幅的相似依赖性，即，角度分布宽度和空间相关长度的减小。测量与理论上的定性一致，在取向理论中，取向紊乱是由液晶分子在基板上吸附过程中取向磁转矩和取向热波动之间的竞争引起的。