Nanocomposites and nanomaterials
Magneto-orientational effects in ferronematics with conically degenerated anchoring at particles surfaces
Burylov S.V., Skosar V.Yu., Burylova N.V., 
Novikov V.F., Voroshilov O.C.
Institute of Transport Systems and Technologies of the NAS of Ukraine,
Pisargevskogo Str.,5,Dnipro -49005, Ukraine. E-mail: S.Burylov@nas.gov.ua
We consider a new type of liquid crystal nanomaterials called ferronematic (FN). They refer to a nematic suspension doped with disk-shaped magnetic particles having specific conically degenerated anchoring of nematic molecules at particles surfaces [1]. 

We investigate the theoretical aspects of magnetically induced orientation transitions in a flat FN cell. We show that depending on the value of the conical anchoring angle and relations between the system material parameters, different FN behavior can be observed under the magnetic field action, including orientational phase transitions of the first and/or second order between uniform and non-uniform states as well as re-entrant transitions – “uniform phase – non-uniform phase – uniform phase – non-uniform phase”. We have determined the conditions of these transitions, calculated and described in detail the orientation profiles of the nematic director and the particles magnetic moments, as well as the concentration distribution of the magnetic impurity in the cell. The magneto-optical response of the cell has also been found and analyzed.

1.	Liu Q.; Ackerman P. J.; Lubensky T. C.; Smalyukh I. I. Biaxial ferromagnetic liquid crystal colloids // Proceedings of the National Academy of Sciences. – 2016, 113, P. 10479-10484