Dynamics of the Frederiks effect in ferronematic / Zubarev AY,Iskakova LY // JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - 1998. - V. 183, l. 1-2. - P. 201-208.

ISSN/EISSN:

0304-8853 / нет данных

Type:

Article

Abstract:

The kinetics of the Frederiks transition in ferronematics (suspensions of stretched ferromagnetic colloidal particles in a nematic solvent have been studied. The particles are assumed to align rigidly along the nematic director, both the initial nematic director n(0) and the external magnetic field H being parallel to the plane of a gap containing 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 two cases were considered, the first one concerns a suspension with zero initial magnetization and the second one concerns a suspension with nonzero magnetization frozen in a solvent. In the first case periodical structures can arise at the onset stage of a Frederiks transition. Their periods increase and their amplitudes decrease with the increasing tau so that for large tau such structures cannot occur. All structures vanish during the final stage of the transition. In the second case the Frederiks effect is initiated by an infinitesimal magnetic field. The structures arising during the phase transition are homogeneous in the directions of both n(0) and H. (C) 1998 Elsevier Science B.V. All rights reserved.

Author keywords:

ferronematics; Frederiks effect NEMATIC LIQUID-CRYSTALS; TRANSITION

DOI:

10.1016/S0304-8853(97)01035-4

Web of Science ID:

ISI:000072696500030

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAR
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	NEMATIC LIQUID-CRYSTALS; TRANSITION
Research-Areas	Materials Science; Physics
Web-of-Science-Categories	Materials Science, Multidisciplinary; Physics, Condensed Matter
ResearcherID-Numbers	Zubarev, Adrey/B-4752-2014
Number-of-Cited-References	17
Usage-Count-Since-2013	1
Journal-ISO	J. Magn. Magn. Mater.
Doc-Delivery-Number	ZD538