Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/51014
Title: Nonmonotonic field-dependent magnetic permeability of a paramagnetic ferrofluid emulsion
Authors: Ivanov, Alexey O.
Kuznetsova, Olga B.
Issue Date: 2012
Citation: Ivanov A. O. Nonmonotonic field-dependent magnetic permeability of a paramagnetic ferrofluid emulsion / Alexey O. Ivanov, Olga B. Kuznetsova // Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. — 2012. — Vol. 85. — № 4.
Abstract: The ferrofluid emulsion, made of kerosene-based ferrofluid droplets suspended in nonmiscible aviation oil, demonstrates experimentally the nonmonotonic dependence of the effective magnetic permeability as a function of the uniform static magnetic field. In weak fields the emulsion permeability rapidly grows; it reaches its maximum at fields on the order of 1 kA/m; after that, it decays to zero. The theoretical explanation of the effect, as we show here, could be based on the following idea: In a weak magnetic field the growth of the induced droplet magnetic moment is faster than the linear one due to the droplet elongation accompanied by the reduction of the demagnetizing field. Further increase of the external magnetic field strength cannot lead to a significant decrease of the demagnetizing field, as the droplets are already highly elongated. On the other hand, the magnetic susceptibility of the ferrofluid reduces with the field strength. Thus, the effective magnetic permeability of the ferrofluid suspension starts decreasing. The developed theoretical model describes well the experimental observations. © 2012 American Physical Society.
URI: http://hdl.handle.net/10995/51014
https://elar.urfu.ru/handle/10995/51014
SCOPUS ID: 84860463195
WOS ID: 000303191500009
PURE ID: 1084792
ISSN: 1539-3755
1550-2376
DOI: 10.1103/PhysRevE.85.041405
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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