Dynamic magnetic response of a ferrofluid in a static uniform magnetic field

Timur M. Batrudinov, Yuliya E. Nekhoroshkova, Egor I. Paramonov, Vladimir S. Zverev, Ekaterina A. Elfimova, Alexey O. Ivanov, Philip J. Camp

Research output: Contribution to journalArticlepeer-review

Abstract

A theory for the frequency-dependent magnetic susceptibility of a ferrofluid in a static uniform
magnetic field is developed, including the dipolar interactions between the constituent particles.
Interactions are included within the framework of modified mean-field theory. Predictions are given
for the linear responses of the magnetization to a probing ac field both parallel and perpendicular
to the static field, and are tested against results from Brownian dynamics simulations. The effects
of particle concentration and dipolar coupling constant on the field-dependent static susceptibilities
and the frequency dispersions are shown to be substantial, which justifies taking proper account of
the interactions between particles. The theory is reliable provided that the volume concentration
and dipolar coupling constant are not too large, and within the range of values for real ferro
fluids.
Original languageEnglish
JournalPhysical Review E
Volume98
Issue number5
Early online date6 Nov 2018
DOIs
Publication statusE-pub ahead of print - 6 Nov 2018

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