Low magnetic field induced capacitance changes in ferronematics

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 Fe${}_3$O${}_4$ nanoparticles in a nematic liquid crystal has been studied experimentally. The volume concentration of nanoparticles was ${\varphi }_1$ = 10${}^{-4}$ and ${\varphi }_2$ = 10${}^{-3}$. 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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• Biasing the ferronematic - a new way to detect weak magnetic field
• Optical steering of mutual capacitance in nematic liquid crystal cell