Transformations of the concentration domain structures of liquid magnetics in plane layers 2. Kinetics and the numerical experiment

A. Cebers

Institute of Physics, Latvian University, Salaspils-1, LV-2169, Latvia

Abstract
On the basis of the previously proposed approach w the problem of field-induced structural transformations of the magnetic colloids a nonlinear set of equations describing their kinetics is derived. Although it is shown that with the exception of the physical meaning of the coefficients, this set is analogous to the one employed to describe the phase transitions of amphiphile monolayers and other systems, some major differences do exist, one of which being the possibility of undercooling when the magnetic field is increased. It is noted that no other systems of such kind with a conserved order parameter are known to the author. On the basis of a pseudo-spectral method developed in other investigations, a numerical simulation of the phase separation of a magnetic colloid is performed. According to the results of (he first part of this paper, a stripe concentration domain structure develops when the distribution of the magnetic particles between the diluted and concentrated phases is symmetrical; for a nonsymmetrical distribution, a structure predominates which consists of discrete droplets, or bubbles. Figs 2, Refs 25.