Néel and Brownian rotations in ferronematics

Peter Kopčanský, Natália Tomašovicová, Martina Koneracká, Vlasta Závišová, Milan Timko, Ladislav Tomčo, Nándor Éber, Katalin Fodor-Csorba, Tibor Tóth-Katona, Anikó Vajda, Jan Jadzyn, Eric Beaugnon, Xavier Chaud

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The magnetic Freedericksz transition was studied in the liquid crystal 4-(trans-4'-n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT) doped with spherical magnetite nanoparticles of different size (4.2 nm, 11.4 nm, 31.4 nm and 112.7 nm). The volume concentration of magnetic particles in prepared ferronematics was (π) = 2×10-4. The obtained results showed that doping with the magnetic particles with size smaller than the Shliomis size increases the threshold of the magnetic Freedericksz transition while in the case of doping with the magnetic particles with size larger than the Shliomis size a decrease of the threshold of the magnetic Freedericksz transition was observed. In the case of doping with magnetic particles with size comparable with the Shliomis size, both Néel and Brownian rotations are present, however, the Brownian rotation is dominant.

Original languageEnglish
Pages (from-to)82-86
Number of pages5
JournalPhysics Procedia
Volume9
DOIs
Publication statusPublished - Jan 1 2010

Keywords

  • Ferronematics
  • Liquid crystals
  • Magnetic freedericksz transition
  • Magnetic particles

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kopčanský, P., Tomašovicová, N., Koneracká, M., Závišová, V., Timko, M., Tomčo, L., Éber, N., Fodor-Csorba, K., Tóth-Katona, T., Vajda, A., Jadzyn, J., Beaugnon, E., & Chaud, X. (2010). Néel and Brownian rotations in ferronematics. Physics Procedia, 9, 82-86. https://doi.org/10.1016/j.phpro.2010.11.020