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 = 10−4 and ϕ2 = 10−3. Independent of the type and the volume concentration of the nanoparticles, a linear response to low magnetic fields (far below the magnetic Fr\'eederiksz transition threshold) has been observed, which is not present in the undoped nematic.
@article{arxiv.1401.1617,
title = {Low magnetic field induced capacitance changes in ferronematics},
author = {Natália Tomašovičová and Milan Timko and Zuzana Mitróová and Martina Koneracká and Michal Rajňak and Nándor Éber and Tibor Tóth-Katona and Xavier Chaud and Jan Jadzyn and Peter Kopčanský},
journal= {arXiv preprint arXiv:1401.1617},
year = {2015}
}