A new composite ferronematic system based on the nematic liquid crystal 6CB doped with hematite spindle-like magnetic particles characterized with magnetic moments oriented perpendicularly to their main axes was prepared. The surface acoustic waves (SAWs) were used to study the effect of magnetic particles on liquid crystals' structural changes in a magnetic field using measurements of the attenuation of SAW propagating along the ferronematic liquid crystal surface. For a study of new composite materials' orientational properties, the ferronematic samples were prepared with three different lengths of the particles and with the volume concentrations of particles φ₁ = 10⁻³, φ₂ = 10^−4, and φ₃ = 10⁻⁵. SAW attenuation response to the external magnetic field was investigated experimentally for two different directions of the magnetic field regarding the cell position, perpendicular and/or parallel to the LC cell. Experimental results validated a decrease of the threshold field in the ferronematic samples in comparison with the pure 6CB for the field in a perpendicular direction and an increase of the threshold shift with a growth of both the volume fraction of solid impurity and the length of particles for magnetic field applied perpendicularly to the cell plane. The effect of particle concentration on the magnitude of structural changes and also on the large residual attenuation at decreasing the magnetic field was observed in this arrangement. The parallel magnetic field direction led to the similar behavior of investigated ferronematic systems in early studied magnetic particles and provided switching processes.

制备了一种基于向列液晶 6CB 掺杂的新型复合铁素体系统，其中掺杂了赤铁矿纺锤状磁性颗粒，其磁矩垂直于其主轴取向。表面声波 (SAW) 用于通过测量沿亚铁液晶表面传播的 SAW 的衰减来研究磁性粒子对磁场中液晶结构变化的影响。为了研究新型复合材料的取向特性，制备了三种不同长度的颗粒和颗粒体积浓度φ ₁  = 10 ^-3，φ ₂  = 10 ^{-4 ，}并且φ ₃  = 10 ^-5. 对外部磁场的 SAW 衰减响应通过实验研究了两个不同方向的磁场，即关于单元位置、垂直和/或平行于 LC 单元。实验结果证实，与纯 6CB 相比，铁素体样品中的阈值场在垂直方向上降低，阈值漂移随着固体杂质的体积分数和颗粒长度的增加而增加。磁场垂直施加到细胞平面。在这种布置中观察到粒子浓度对结构变化幅度以及减小磁场时大的残余衰减的影响。