Effect of spherical magnetic particles on liquid crystals behavior studied by surface acoustic waves

被引：21
作者：
Bury, Peter [1 ]
Kudelcik, Jozef [1 ]
Hardon, Stefan [1 ]
Vevericik, Marek [1 ]
Kopcansky, Peter [2 ]
Timko, Milan [2 ]
Zavisova, Vlasta [2 ]
机构：
[1] Univ Zilina, Dept Phys, Zilina 01001, Slovakia
[2] Slovak Acad Sci, Inst Expt Phys, Watsonova 47, Kosice 04001, Slovakia
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2017年 / 423卷
关键词：
Ferronematics; Liquid crystal; Magnetic particles; Structural changes; Surface acoustic wave; SENSOR;
D O I：
10.1016/j.jmmm.2016.09.023
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of spherical magnetic particles (Fe3O4) on liquid crystals (6CHBT) behavior and structural changes in electric and weak magnetic fields was studied by means of the attenuation of surface acoustic wave ( SAW) of frequency 30 MHz propagating along ferronematic liquid crystals. Three low volume concentrations (phi = 1 x 10(-5), 1 x 10(-4) and 1 x 10(-3)) of spherical magnetic particles were added to liquid crystal during its isotropic phase. In contrast to undoped 6CHTB the distinctive SAW attenuation responses induced by both electric and magnetic fields in studied ferronematic liquid crystals below Freedericksz transition have been observed suggesting both structural changes and the orientational coupling between magnetic moments of magnetic particles and the director of the liquid crystal. The geometrical re-ranking of magnetic particles was registered only for some orientations of magnetic field. Observed results confirmed the significant influence of the presence of magnetic particles on the structural properties and following behavior of 6CHTB.
引用
收藏
页码：57 / 60
页数：4
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