A value of about 20% relative change of the dielectric constant of mineral-oil-based ferrofluids was observed in an external magnetic field. The cluster model, based on a long-chain model, was proposed for the explanation of experimental data.

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The appearance and growth process of needle-like aggregates in thin films of magnetic fluid within a magnetic field are investigated. The results show that the average length of aggregates in a given magnetic field depends on the method of application of the magnetic field. However, the full needle length per unit area as a first approximation to a condensed phase volume is approximately the same.

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