The University of Southampton
University of Southampton Institutional Repository

The Frederiks effect and related phenomena in ferronematic materials

Zadorozhnii, V.I., Sluckin, T.J., Reshetnyak, V.Yu. and Thomas, K.S. (2008) The Frederiks effect and related phenomena in ferronematic materials SIAM Journal on Applied Mathematics, pp. 1688-716.

Record type: Article

Abstract

Using continuum and statistical mechanical theories, we study the switching properties of a ferronematic in a nematic liquid crystal cell subject to homeotropic boundary conditions at the cell and particle walls. An external magnetic field normal to the cell plane is also imposed. At low fields we find thresholdless switching of the nematic director, consistent with experimental data. At higher fields, there are three regimes, depending on the strength of the anchoring interaction between the director and the ferroparticle orientation. For low anchoring strengths, there is an inverse Frederiks effect, and the nematic reorientation reduces and then disappears continuously at a critical magnetic field. At intermediate fields, the degree of reorientation reduces at high fields but remains finite. For high fields, however, the director switching saturates. The dimensionless temperature scale in the problem involves the temperature, the mean nematic elastic constant, the colloidal density, and the cell dimension. If this quantity is sufficiently low, then high magnetic fields can cause magnetic segregation. The segregation order parameter is coupled to the director distortion, and this can change the inverse Frederiks transition into a first order transition, leading to bistability in an intermediate field regime. These features are perturbed but not changed structurally by the effect of a small bias magnetic field (< 10 Oe) normal to the unperturbed director. Subject to suitable choice of parameters, the theory is also quantitatively consistent with the results of the classic experiment of Chen and Amer in 1983.

Full text not available from this repository.

More information

Published date: 2008
Additional Information: Imported from ISI Web of Science
Organisations: Electronic & Software Systems

Identifiers

Local EPrints ID: 269853
URI: http://eprints.soton.ac.uk/id/eprint/269853
ISSN: 0036-1399
PURE UUID: c7838729-2d30-4984-929f-abd8c3e0a747

Catalogue record

Date deposited: 21 Apr 2010 07:46
Last modified: 18 Jul 2017 06:51

Export record

Contributors

Author: V.I. Zadorozhnii
Author: T.J. Sluckin
Author: V.Yu. Reshetnyak
Author: K.S. Thomas

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×