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Magnetic properties of ferrofuid emulsions: model of non-interacting droplets

A. O. Ivanov , O. B. Kuznetsova , I. M. Subbotin

Ural State University, 51 Lenin Av., 620000 Ekaterinburg, Russia

Experimental study of the static magnetic properties of ferrofluid emulsions has demonstrated the nonmonotonic field dependence of the emulsion magnetic permeability. In a weak magnetic field, the emulsion permeability rapidly grows and reaches a maximum, and then it decreases slowly in stronger fields. We suggest a theoretical description of the effect based on the following idea. The weak field growth of the emulsion magnetic permeability is caused by the droplet elongation and the resulting reduction of demagnetizing field under the constant value of the ferrofluid magnetic susceptibility. Subsequent decrease of the emulsion magnetic permeability in a stronger magnetic field is explained by the decay of the ferrofluid magnetic susceptibility under an approximately constant degree of droplet elongation. Figs 2, Refs 11.

Magnetohydrodynamics 47, No. 2, 129-134, 2011 [PDF, 0.10 Mb]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X