Nonmonotonic field-dependent magnetic permeability of a paramagnetic ferrofluid emulsion / Ivanov Alexey O.,Kuznetsova Olga B. // PHYSICAL REVIEW E. - 2012. - V. 85, l. 4, 1.

ISSN/EISSN:

1539-3755 / нет данных

Type:

Article

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.

Author keywords:

нет данных

DOI:

10.1103/PhysRevE.85.041405

Web of Science ID:

ISI:000303191500009

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	APR 23
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	041405
Research-Areas	Physics
Web-of-Science-Categories	Physics, Fluids \& Plasmas; Physics, Mathematical
Author-Email	alexey.ivanov@usu.ru
ResearcherID-Numbers	Ivanov, Alexey/E-4442-2011
ORCID-Numbers	Ivanov, Alexey/0000-0001-8239-4039
Funding-Acknowledgement	Ministry of Education and Science of the Russian Federation
Funding-Text	The research was partly supported by the Ministry of Education and Science of the Russian Federation.
Number-of-Cited-References	18
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	19
Journal-ISO	Phys. Rev. E
Doc-Delivery-Number	931CH