Low Magnetic Field Response in Ferronematics
V. Gdovinováa, N. Tomašovičová a, V. Závišová a, N. Éber b, T. Tóth-Katona b, F. Royer c, D. Jamon c, J. Jadzyn d and P. Kopčanský a
aInstitute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia
bInstitute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary
cUniversité de Saint Etienne, Saint Etienne, France
dInstitute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland
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In this work the 4-n-hexyl-4'-cyanobiphenyl liquid crystal was doped with differently shaped magnetite nanoparticles. The structural changes were observed by capacitance measurements. Influence of the shape of magnetic particles on magnetic Fréedericksz transition depends on the type of anchoring, which is characterized by the density of the anchoring energy and by the initial orientation between the liquid crystal molecules and the magnetic moment of the magnetic particles. It was observed that in the case of doping with spherical particles, the critical magnetic field is shifted to higher values with increase of volume concentration of the magnetic nanoparticles but decreases with increase of biasing voltage. In the case of doping with rod-like particles, the critical magnetic field is almost independent of the volume concentration of the magnetic nanoparticles.

DOI: 10.12693/APhysPolA.131.934
PACS numbers: 75.50.Mm, 61.30.Gd, 61.30.Hn