Nonequilibrium structures in the thin layers of ferronematics / Zubarev AY,Iskakova LY // PHYSICAL REVIEW E. - 1998. - V. 57, l. 4. - P. 4296-4304.

ISSN/EISSN:

1063-651X / нет данных

Type:

Article

Abstract:

The onset of remagnetization of ferronematics (suspensions of stretched ferromagnetic colloidal particles in nematic solvent) filling a thin flat gap has been studied. We supposed that the average deviation of the particles axis from nematic director n is very small in each volume of the sample; both the initial nematic director n(0) and the external magnetic field H being parallel to the plane of a gap contained by a sample. On the basis of a microscopic analysis and the Fokker-Planck equation for a ferromagnetic particle the macroscopic equation describing the kinetics of the suspension remagnetization has been derived. This equation includes an empirical relaxation time tau. With the help of this equation three cases have been considered. The first one concerns a suspension with zero initial magnetization and field H perpendicular to n(0). The second one concerns a suspension with a frozen to a solvent nonzero magnetization (tau is greater than time of observation) and the field H directed such as in the first case. The third situation corresponds to nonzero initial magnetization M-0 of a suspension, M-0 being parallel to n(0) and field H being antiparallel to M-0. In the first and third cases remagnetization occurs as the second order phase transition only if H exceeds some critical value H, and periodic structures can arise at the initial stage of this process if H > H-c1 > H-c. In the second case ferronematic remagnetization is initiated by an infinitesimal magnetic field. The structures arising during this phase transition are homogeneous in both directions of n(0) and H.

Author keywords:

NEMATIC LIQUID-CRYSTALS; TRANSITION; DYNAMICS

DOI:

10.1103/PhysRevE.57.4296

Web of Science ID:

ISI:000073070500069

Соавторы в МНС:

Другие поля

Поле	Значение
Month	APR
Publisher	AMERICAN PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Keywords-Plus	NEMATIC LIQUID-CRYSTALS; TRANSITION; DYNAMICS
Research-Areas	Physics
Web-of-Science-Categories	Physics, Fluids \& Plasmas; Physics, Mathematical
ResearcherID-Numbers	Zubarev, Adrey/B-4752-2014
Number-of-Cited-References	15
Journal-ISO	Phys. Rev. E
Doc-Delivery-Number	ZH084