Dynamic magneto-optic coupling in a ferromagnetic nematic liquid crystal
Abstract
Hydrodynamics of complex fuids with multiple order parameters is governed by a set of dynamic equations with many material constants, of which only some are easily measurable. We present a unique example of a dynamic magneto-optic coupling in a ferromagnetic nematic liquid, in which long-range orientational order of liquid crystalline molecules is accompanied by long-range magnetic order of magnetic nanoplatelets. We investigate the dynamics of the magneto-optic response experimentally and theoretically and find out that it is significantly affected by the dissipative dynamic cross-coupling between the nematic and magnetic order parameters. The cross-coupling coefficient determined by fitting the experimental results with a macroscopic theory is of the same order of magnitude as the dissipative coefficient (rotational viscosity) that governs the reorientation of pure liquid crystals.
Cite
@article{arxiv.1803.07075,
title = {Dynamic magneto-optic coupling in a ferromagnetic nematic liquid crystal},
author = {Tilen Potisk and Daniel Svenšek and Helmut R. Brand and Harald Pleiner and Darja Lisjak and Natan Osterman and Alenka Mertelj},
journal= {arXiv preprint arXiv:1803.07075},
year = {2018}
}
Comments
6 pages, 5 figures, 41 references. arXiv admin note: text overlap with arXiv:1803.04898