The influence of interparticle correlations and self-assembly on the dynamic initial magnetic susceptibility spectra of ferrofluids

A. O. Ivanov*, S. S. Kantorovich, E. A. Elfimova, V. S. Zverev, Julien Sindt, Philip Camp

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Using computer simulations and a mean-field theoretical approach, we study how the growth in dipolar interparticle correlations manifests itself in the frequency-dependent initial magnetic susceptibility of a ferrofluid. Our recently developed theory gives the correct single-particle Debye-theory results in the low-concentration, non-interacting regime; and it yields the exact leading-order contributions from interparticle correlations. The susceptibility spectra are analysed in terms of the low-frequency behaviours of the real and imaginary parts, and the position of the peak in the imaginary part. By comparing the theoretical predictions to the results from Brownian dynamics simulations, it is possible to identify the conditions where correlations are important, but where self-assembly has not developed. We also provide a qualitative explanation for the behaviour of spectra beyond the mean-field limit.

Original languageEnglish
Pages (from-to)141-144
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume431
Early online date28 Sep 2016
DOIs
Publication statusE-pub ahead of print - 28 Sep 2016

Keywords

  • Dipolar interaction
  • Dynamic initial magnetic susceptibility
  • Dynamic spectra
  • Magnetic nanoparticles
  • Polydispersity

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