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

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Izvleček
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.

Jezik:Angleški jezik
Ključne besede:condensed matter physics, nematic liquid crystals, ferromagnetic liquid crystals, fluid dynamics, complex fluids
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FMF - Fakulteta za matematiko in fiziko
Leto izida:2018
Št. strani:Str. 042705-1-042705-13
Številčenje:Vol. 97, iss. 4
PID:20.500.12556/RUL-101615 Povezava se odpre v novem oknu
UDK:532.5:538.9
ISSN pri članku:2470-0045
DOI:10.1103/PhysRevE.97.042705 Povezava se odpre v novem oknu
COBISS.SI-ID:3200356 Povezava se odpre v novem oknu
Datum objave v RUL:21.06.2018
Število ogledov:17015
Število prenosov:670
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Gradivo je del revije

Naslov:Physical review
Skrajšan naslov:Phys. rev., E
Založnik:American Physical Society
ISSN:2470-0045
COBISS.SI-ID:2048366611 Povezava se odpre v novem oknu

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:fizika kondenzirane snovi, nematski tekoči kristali, feromagnetni tekoči kristali, dinamika tekočin, kompleksne tekočine

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