Features of magnetic susceptibility of a ferrofluid with a non-magnetic filler

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Abstract

We presented the results of an experimental study of the features of the magnetic susceptibility of a magnetic fluid with a non-magnetic filler. It is established that the dependence of magnetic susceptibility on the concentration of non-magnetic filler has features. The explanation of the detected effects is based on the assumption of the influence of surface forces on the relaxation processes of the magnetic moment of magnetic particles. It was also found that the dependences of the magnetic susceptibility of a magnetic fluid with a non-magnetic filler on the magnitude of the external magnetic field differ from similar dependences for a magnetic fluid without a filler.

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About the authors

Yu. I. Dikansky

North-Caucasus Federal University

Email: dgladkikh@ncfu.ru
Russian Federation, Stavropol

D. V. Gladkikh

North-Caucasus Federal University

Author for correspondence.
Email: gladkikhdv@mail.ru
Russian Federation, Stavropol

D. S. Dorozhko

North-Caucasus Federal University

Email: gladkikhdv@mail.ru
Russian Federation, Stavropol

A. V. Kurnev

North-Caucasus Federal University

Email: dgladkikh@ncfu.ru
Russian Federation, Stavropol

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Supplementary files

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2. Fig. 1. Dependence of the magnetic susceptibility of the MF sample (φm0 = 14%) on the volume concentration of the non-magnetic filler: 1 — experiment, 2 — theoretical dependence (in accordance with formula (3)).

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3. Fig. 2. Dependence of the magnetic susceptibility of the sample on the concentration of the magnetic phase: 1 - experiment, 2 - theoretical dependence (in accordance with formula (2)).

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4. Fig. 3. Dependence of the magnetic susceptibility of MF on the external field strength at different volume concentrations of the non-magnetic filler: 1 — δ = 0 (MF without filler), 2 — δ = 0.25, 3 — δ = 0.4, 4 — δ = 0.5, 5 — δ = 0.57, 6 — δ = 0.625.

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