Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111521
Title: Theoretical Study of the Magnetization Dynamics of Nondilute Ferrofluids
Authors: Berkov, D. V.
Iskakova, L. Yu.
Zubarev, A. Yu.
Issue Date: 2009
Publisher: American Physical Society (APS)
Citation: Berkov D. V. Theoretical Study of the Magnetization Dynamics of Nondilute Ferrofluids / D. V. Berkov, L. Yu. Iskakova, A. Yu. Zubarev // Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. — 2009. — Vol. 79. — Iss. 2. — 021407.
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 χ (ω) = χ′ (ω) +i χ″ (ω) we find that this interaction leads to an overall increase of χ″ (ω) and shifts the χ″ (ω) 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 ∼10%, and for the ac susceptibility, up to 5%. © 2009 The American Physical Society.
Keywords: ASSOCIATION REACTIONS
COMPUTER SIMULATION
DYNAMICS
MAGNETIC FLUIDS
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
MAGNETS
AC SUSCEPTIBILITIES
ANALYTICAL APPROACHES
COMPLEX AC SUSCEPTIBILITIES
DC MAGNETIZATIONS
DIPOLE MODELS
EXTERNAL FIELDS
FERRO-FLUIDS
FERROFLUID
INTER-PARTICLE INTERACTIONS
LANGEVIN DYNAMICS
LOWER FREQUENCIES
MAGNETIZATION DYNAMICS
MAGNETIZATION RELAXATIONS
NUMERICAL SIMULATIONS
PARTICLE AGGREGATES
PARTICLE VOLUME FRACTIONS
QUANTITATIVE AGREEMENTS
SECOND ORDERS
SPHERICAL PARTICLES
THEORETICAL INVESTIGATIONS
THEORETICAL STUDIES
VIRIAL EXPANSIONS
AGGLOMERATION
URI: http://hdl.handle.net/10995/111521
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 62749206305
ISSN: 1539-3755
metadata.dc.description.sponsorship: This work has been done under the financial support of RFFI, Grants No. 06-01-00125, No. 07-02-00079, No. 07-01-960769Ural, No. 08-02-00647, Fund CRDF, No. PG07-005-02.
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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