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首先讨论了大系数液晶材料具有抗磁性的原因； 然后讨论了向列相液晶、 扭曲盒液晶和胆甾相液晶在磁作用下产生的Freedericks转变； 最后讨论了磁相干长度。
Firstly, the reasons for the diamagnetism of LCF are discussed. Then the Freedericks transitions of nematic liquid crystal, twisted LC liquid crystal and cholesteric liquid crystal under magnetic action are discussed. Finally, the magnetic coherence length is discussed.