Effect of Spherical, Rod-Like and Chain-Like Magnetic Nanoparticles on Magneto-Optical Response of Nematics
P. Burya, M. Veveričíka, P. Kopčanskýb, M. Timkob, V. Závišováb
aDepartment of Physics, Žilina University, Univerzitná 1, 010 26 Žilina, Slovakia
bInstitute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
Received: July 31, 2018; revised version March 29, 2019; in final form July 16, 2019
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The effect of magnetic nanoparticles of low concentrations and different shapes, including spherical, rod-like, and chain-like shape on the magneto-optical response of nematic liquid crystal 6CHBT is investigated. The magneto-optical effect was examined using a linearly polarized laser beam (532 nm) passed through liquid crystal cell under both linearly increasing and pulsed magnetic fields. The analysis of observed magneto-optical characteristics and magneto-optical time responses confirmed the role of both concentration and shape of magnetic particles on the resultant magneto-optical behavior concerning both its stability and switching time.

topics: liquid crystal, magnetic particles, ferronematics, magneto-optical response