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Effects of flow on the dynamics of a ferromagnetic nematic liquid crystal
ID Potisk, Tilen (Author), ID Pleiner, Harald (Author), ID Svenšek, Daniel (Author), ID Brand, Helmut R. (Author)

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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 two 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 a magnetization in or perpendicular to the shear plane. In the former case we find that small in-plane magnetic fields are suffcient to suppress tumbling and that thus 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 analogues of the three Miesowicz viscosities well-known from usual nematic liquid crystals, corresponding to nine different configurations. Combinations of these can be used to determine several dynamic coeffcients experimentally.

Language:English
Keywords:condensed matter physics, nematic liquid crystals, ferromagnetic liquid crystals, fluid dynamics, complex fluids
Typology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Year:2018
Number of pages:Str. 042705-1-042705-13
Numbering:Vol. 97, iss. 4
PID:20.500.12556/RUL-101615 This link opens in a new window
UDC:532.5:538.9
ISSN on article:2470-0045
DOI:10.1103/PhysRevE.97.042705 This link opens in a new window
COBISS.SI-ID:3200356 This link opens in a new window
Publication date in RUL:21.06.2018
Views:17062
Downloads:672
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Record is a part of a journal

Title:Physical review
Shortened title:Phys. rev., E
Publisher:American Physical Society
ISSN:2470-0045
COBISS.SI-ID:2048366611 This link opens in a new window

Secondary language

Language:Slovenian
Keywords:fizika kondenzirane snovi, nematski tekoči kristali, feromagnetni tekoči kristali, dinamika tekočin, kompleksne tekočine

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