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      Dynamics of Magnetic Fluids in Crossed DC and AC Magnetic Fields

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          Abstract

          In this study, we derived the equations describing the dynamics of a magnetic fluid in crossed magnetic fields (bias and alternating probe fields), considering the field dependence of the relaxation times, interparticle interactions, and demagnetizing field has been derived. For a monodisperse fluid, the dependence of the output signal on the bias field and the probe field frequency was constructed. Experimental studies were conducted in a frequency range up to 80 kHz for two samples of fluids based on magnetite nanoparticles and kerosene. The first sample had a narrow particle size distribution, low-energy magneto dipole interactions, and weak dispersion of dynamic susceptibility. The second sample had a broad particle size distribution, high-energy magneto dipole interactions, and strong dispersion of dynamic susceptibility. In the first case, the bias field led to the appearance of short chains. In the second case, we found quasi-spherical clusters with a characteristic size of 100 nm. The strong dependence of the output signal on the particle size allowed us to use the crossed field method to independently estimate the maximum diameter of the magnetic core of particles.

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          Most cited references 32

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          Synthesis and Characterization of Nanometer-Size Fe3O4and γ-Fe2O3Particles

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            Magnetic fluids

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              Pair correlations in a ferromagnetic colloid

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                Author and article information

                Journal
                Nanomaterials (Basel)
                Nanomaterials (Basel)
                nanomaterials
                Nanomaterials
                MDPI
                2079-4991
                30 November 2019
                December 2019
                : 9
                : 12
                Affiliations
                [1 ]Institute of Continuous Media Mechanics UB RAS, 1, Korolyov str., Perm 614013, Russia; lav@ 123456icmm.ru
                [2 ]Faculty of Physics, Perm State University, Bukireva St. 15, Perm 614990, Russia
                [3 ]Ural Federal University, Lenin av. 51, Ekaterinburg 620000, Russia
                Author notes
                [* ]Correspondence: pshenichnikov@ 123456icmm.ru ; Tel.: +7-343-237-325
                Article
                nanomaterials-09-01711
                10.3390/nano9121711
                6956213
                31801220
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

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