Theoretical study of the magnetization dynamics of nondilute ferrofluids / Berkov D. V.,Iskakova L. Yu.,Zubarev A. Yu. // PHYSICAL REVIEW E. - 2009. - V. 79, l. 2, 1.

ISSN/EISSN:

1539-3755 / 1550-2376

Type:

Article

Abstract:

The paper is devoted to the theoretical investigation of the magnetodipolar interparticle interaction effect on magnetization dynamics in moderately concentrated ferrofluids. We consider a homogenous (without particle aggregates) ferrofluid consisting of identical spherical particles and employ a rigid dipole model, where the magnetic moment of a particle is fixed with respect to the particle itself. In particular, for the magnetization relaxation after the external field is instantly switched off, we show that the magnetodipolar interaction leads to the increase of the initial magnetization relaxation time. For the complex ac susceptibility chi(omega) = chi' (omega) + i chi `'(omega) we find that this interaction leads to an overall increase of chi `'(omega) and shifts the chi `'(omega) peak towards lower frequencies. Comparing results obtained with our analytical approach (second order virial expansion) to numerical simulation data (Langevin dynamics method), we demonstrate that the employed virial expansion approximation gives a good qualitative description of the ferrofluid magnetization dynamics and provides a satisfactory quantitative agreement with numerical simulations for the dc magnetization relaxation, up to the particle volume fraction phi similar to 10\%, and for the ac susceptibility, up to phi approximate to 5\%.

Author keywords:

EQUILIBRIUM PROPERTIES; FLUIDS; SUSCEPTIBILITY; FERROCOLLOIDS; SIMULATIONS; PARTICLES; FIELD

DOI:

10.1103/PhysRevE.79.021407

Web of Science ID:

ISI:000263807300055

Соавторы в МНС:

Другие поля

Поле	Значение
Month	FEB
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	021407
EISSN	1550-2376
Keywords-Plus	EQUILIBRIUM PROPERTIES; FLUIDS; SUSCEPTIBILITY; FERROCOLLOIDS; SIMULATIONS; PARTICLES; FIELD
Research-Areas	Physics
Web-of-Science-Categories	Physics, Fluids \& Plasmas; Physics, Mathematical
ResearcherID-Numbers	Zubarev, Adrey/B-4752-2014
Funding-Acknowledgement	RFFI {[}06-01-00125, 07-02-00079, 0701-960769Ural, 08-02-00647]; CRDF {[}PG07005-02]
Funding-Text	This work has been done under the financial support of RFFI, Grants No. 06-01-00125, No. 07-02-00079, No. 0701-960769Ural, No. 08-02-00647, Fund CRDF, No. PG07005-02.
Number-of-Cited-References	24
Usage-Count-Since-2013	7
Journal-ISO	Phys. Rev. E
Doc-Delivery-Number	413QJ