Some Conditions of Ferromagnetic Liquid Crystal Existence

Abstract

The possibility of the existence of the ferromagnetic liquid crystal based on analogy between electric and magnetic phenomena is considered. Nematic and smectic liquid crystalline states and symmetry conditions are discussed. The most common case -hypothetical fcrromagnetic-ferroelectric liquid crystal (FFLC) and some of the field effects on it are described based on Landau free energy expression.

Unusual intermolecular magnetic interaction observed in an all-organic radical liquid crystal

“…The possibility of a ferromagnetic rod-like liquid-crystalline (LC) material has been considered to be unrealistic due to the inaccessibility of long-range spin-spin interactions between rotating molecules in the LC state, 5 although theoretical considerations on the existence and dynamics of ferromagnetic liquid crystals have been presented. 11,12 The only previous approach to ferromagnetic LC materials was based on the dispersion of single-domain magnetic metal oxide particles such as g-Fe 2 O 3 in an LC host. 5,13,14 With the above situations in mind, by making use of the racemate of a chiral all-organic radical LC compound 1, which contains a polar and chiral cyclic-nitroxide unit in the mesogen core and shows a smectic C (SmC) phase with low viscosity over a wide temperature range (Fig.…”