Effects of flow on the dynamics of a ferromagnetic nematic liquid crystal

Physical Review. E
Tilen PotiskH R Brand

Abstract

We investigate the effects of flow on the dynamics of ferromagnetic nematic liquid crystals. As a model, we study the coupled dynamics of the magnetization, M, the director field, n, associated with the liquid crystalline orientational order, and the velocity field, v. We evaluate how simple shear flow in a ferromagnetic nematic is modified in the presence of small external magnetic fields, and we make experimentally testable predictions for the resulting effective shear viscosity: an increase by a factor of 2 in a magnetic field of about 20 mT. Flow alignment, a characteristic feature of classical uniaxial nematic liquid crystals, is analyzed for ferromagnetic nematics for the two cases of magnetization in or perpendicular to the shear plane. In the former case, we find that small in-plane magnetic fields are sufficient to suppress tumbling and thus that the boundary between flow alignment and tumbling can be controlled easily. In the latter case, we furthermore find a possibility of flow alignment in a regime for which one obtains tumbling for the pure nematic component. We derive the analogs of the three Miesowicz viscosities well-known from usual nematic liquid crystals, corresponding to nine different configurations. Combi...Continue Reading

References

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Apr 16, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Janez Turk, Daniel Svenšek
Jul 1, 2015·The European Physical Journal. E, Soft Matter·Helmut R BrandHarald Pleiner
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Dec 20, 2016·Nature Materials·Paul J Ackerman, Ivan I Smalyukh
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Feb 17, 2018·Physical Review. E·Tilen PotiskDaniel Svenšek

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Citations

Aug 25, 2018·Soft Matter·Nerea SebastiánAlenka Mertelj
Apr 16, 2020·Physical Review. E·Harald PleinerHelmut R Brand
Oct 18, 2020·Polymers·Dejan BošnjakovićIrena Drevenšek-Olenik
Feb 20, 2021·Physical Review. E·Helmut R Brand, Harald Pleiner

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