Capacitance changes in ferronematic liquid crystals induced by low magnetic fields

Natália Tomašovičová, Milan Timko, Zuzana Mitróová, Martina Koneracká, Michal Rajňak, Nándor Éber, Tibor Tóth-Katona, Xavier Chaud, Jan Jadzyn, and Peter Kopčanský
Phys. Rev. E 87, 014501 – Published 3 January 2013

Abstract

The response in capacitance to low external magnetic fields (up to 0.1 T) of suspensions of spherical magnetic nanoparticles, single-wall carbon nanotubes (SWCNT), SWCNT functionalized with carboxyl group (SWCNT-COOH), and SWCNT functionalized with Fe3O4 nanoparticles in a nematic liquid crystal has been studied experimentally. The volume concentration of nanoparticles was ϕ1=104 and ϕ2=103. Independent of the type and the volume concentration of the nanoparticles, a linear response to low magnetic fields (far below the magnetic Fréederiksz transition threshold) has been observed, which is not present in the undoped nematic.

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  • Received 26 July 2012

DOI:https://doi.org/10.1103/PhysRevE.87.014501

©2013 American Physical Society

Authors & Affiliations

Natália Tomašovičová1, Milan Timko1, Zuzana Mitróová1, Martina Koneracká1, Michal Rajňak1, Nándor Éber2, Tibor Tóth-Katona2,*, Xavier Chaud3, Jan Jadzyn4, and Peter Kopčanský1

  • 1Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 04001 Košice, Slovakia
  • 2Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49, Hungary
  • 3Grenoble High Magnetic Field Laboratory, Centre National de la Recherche Scientifique, 25 Avenue des Martyrs, Grenoble, France
  • 4Institute of Molecular Physics, Polish Academy of Sciences, 60179 Poznan, Poland

  • *tothkatona.tibor@wigner.mta.hu

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Vol. 87, Iss. 1 — January 2013

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