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Open AccessArticle

Dynamics of Magnetic Fluids in Crossed DC and AC Magnetic Fields

1
Institute of Continuous Media Mechanics UB RAS, 1, Korolyov str., Perm 614013, Russia
2
Faculty of Physics, Perm State University, Bukireva St. 15, Perm 614990, Russia
3
Ural Federal University, Lenin av. 51, Ekaterinburg 620000, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1711; https://doi.org/10.3390/nano9121711
Received: 24 October 2019 / Revised: 26 November 2019 / Accepted: 27 November 2019 / Published: 30 November 2019
(This article belongs to the Collection Applications of Magnetic Nanomaterials)
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. View Full-Text
Keywords: magnetic fluid; crossed magnetic fields; magnetite nanoparticles; relaxation times; dynamic susceptibility; interparticle interactions; chains; clusters magnetic fluid; crossed magnetic fields; magnetite nanoparticles; relaxation times; dynamic susceptibility; interparticle interactions; chains; clusters
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MDPI and ACS Style

Pshenichnikov, A.; Lebedev, A.; Ivanov, A.O. Dynamics of Magnetic Fluids in Crossed DC and AC Magnetic Fields. Nanomaterials 2019, 9, 1711.

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