We study the influence of anchoring energy on the orientational structure of a cholesteric liquid crystal in a layer with soft homeotropic anchoring on the boundaries. We consider magnetic field induced transition from the uniform homeotropic nematic phase to the cholesteric phase. We show that this phase transition can occur due to the change of external magnetic field, oriented normally to the cell walls, or due to the change of the layer thickness, and can be either the first- or the second order transition. We determine the conditions of the phase transition hysteresis. We show that the variation of anchoring energy causes the change of the phase transition order, and can also lead to occurrence of the planar alignment in the layer. We also propose the method for measurement of the polar anchoring energy. We show that for some values of polar anchoring energy and the layer thickness, the initial uniform homeotropic state becomes unstable relative to small long-wave perturbations periodical along the layer.

我们研究了锚固能量对胆甾型液晶在边界上具有软质均质锚固层中的取向结构的影响。我们考虑磁场引起的从均匀的垂直向列相到胆甾相的跃迁。我们表明，这种相变可能是由于外部磁场的变化（通常垂直于细胞壁）或由于层厚度的变化而发生的，并且可以是一阶或二阶跃迁。我们确定相变磁滞的条件。我们表明，锚固能量的变化会引起相变阶数的变化，并且还会导致层中平面对齐的发生。我们还提出了用于测量极性锚定能的方法。