The structural instabilities in ferronematic based on liquid crystal with negative diamagnetic susceptibility anisotropy

Peter Kopčanský, Natália Tomašovičovás, Martina Koneracká, Milan Timko, Vlasta Závišová, Nándor Eber, K. Fodor-Csorba, T. Tóth-Katona, A. Vajda, Jan Jadzyn, Eric Beaugnon, Xavier Chaud

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The studied ferronematic is a nematic liquid crystal (ZLI1695) of low negative anisotropy of the diamagnetic susceptibility (χa3O4. Structural instabilities are interpreted within Burylov and Raikher's theory. The high magnetic fields were oriented perpendicular (Freedericksz transition) or parallel to the initial director. Using capacitance measurements the Freedericksz threshold magnetic field of the ferronematic BFN, and the critical magnetic field B max, at which the initial parallel orientation between the director and the magnetic moment of magnetic particles breaks down, have been determined. The values of these quantities have been used to estimate the surface density of the anchoring energy W of liquid crystal molecules on the surface of the magnetic particles. The obtained values indicate a soft anchoring of the liquid crystal on the magnetic particles with a preferred parallel orientation of the magnetic moment of magnetic particles and the director.

Original languageEnglish
Pages (from-to)3696-3700
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume322
Issue number22
DOIs
Publication statusPublished - Nov 2010

Fingerprint

Liquid Crystals
Liquid crystals
Anisotropy
liquid crystals
Magnetic fields
Magnetic moments
magnetic permeability
anisotropy
Capacitance measurement
Nematic liquid crystals
magnetic moments
magnetic fields
Molecules
breakdown
capacitance
thresholds
estimates
molecules
energy

Keywords

  • Ferronematic
  • Liquid crystal
  • Structural transition

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Kopčanský, P., Tomašovičovás, N., Koneracká, M., Timko, M., Závišová, V., Eber, N., ... Chaud, X. (2010). The structural instabilities in ferronematic based on liquid crystal with negative diamagnetic susceptibility anisotropy. Journal of Magnetism and Magnetic Materials, 322(22), 3696-3700. https://doi.org/10.1016/j.jmmm.2010.07.028

The structural instabilities in ferronematic based on liquid crystal with negative diamagnetic susceptibility anisotropy. / Kopčanský, Peter; Tomašovičovás, Natália; Koneracká, Martina; Timko, Milan; Závišová, Vlasta; Eber, Nándor; Fodor-Csorba, K.; Tóth-Katona, T.; Vajda, A.; Jadzyn, Jan; Beaugnon, Eric; Chaud, Xavier.

In: Journal of Magnetism and Magnetic Materials, Vol. 322, No. 22, 11.2010, p. 3696-3700.

Research output: Contribution to journalArticle

Kopčanský, P, Tomašovičovás, N, Koneracká, M, Timko, M, Závišová, V, Eber, N, Fodor-Csorba, K, Tóth-Katona, T, Vajda, A, Jadzyn, J, Beaugnon, E & Chaud, X 2010, 'The structural instabilities in ferronematic based on liquid crystal with negative diamagnetic susceptibility anisotropy', Journal of Magnetism and Magnetic Materials, vol. 322, no. 22, pp. 3696-3700. https://doi.org/10.1016/j.jmmm.2010.07.028
Kopčanský, Peter ; Tomašovičovás, Natália ; Koneracká, Martina ; Timko, Milan ; Závišová, Vlasta ; Eber, Nándor ; Fodor-Csorba, K. ; Tóth-Katona, T. ; Vajda, A. ; Jadzyn, Jan ; Beaugnon, Eric ; Chaud, Xavier. / The structural instabilities in ferronematic based on liquid crystal with negative diamagnetic susceptibility anisotropy. In: Journal of Magnetism and Magnetic Materials. 2010 ; Vol. 322, No. 22. pp. 3696-3700.
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