High concentration ferronematics in low magnetic fields

Tóth Katona, Tibor and Salamon, Péter and Éber, Nándor and Tomašovičová, N. and Mitroova, Z. and Kopčanský, P. (2014) High concentration ferronematics in low magnetic fields. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 372. pp. 117-121. ISSN 0304-8853

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Abstract

We investigated experimentally the magneto-optical and dielectric proper- ties of magnetic-nanoparticle-doped nematic liquid crystals (ferronematics). Our studies focus on the effect of the very small orienting bias magnetic field Bbias, and that of the nematic director pretilt at the boundary surfaces in our systems sensitive to low magnetic fields. Based on the results we as- sert that Bbias is not necessarily required for a detectable response to low magnetic fields, and that the initial pretilt, as well as the aggregation of the nanoparticles play an important (though not yet explored enough) role.

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