The influence of interparticle correlations and self-assembly on the dynamic initial magnetic susceptibility spectra of ferrofluids
- Author(s)
- Alexey O. Ivanov, S. S. Kantorovich, Ekaterina A. Elfimova, Vladimir S. Zverev, Julien O. Sindt, Philip J. Camp
- 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.
- Organisation(s)
- Computational and Soft Matter Physics
- External organisation(s)
- Ural Federal University, University of Edinburgh
- Journal
- Journal of Magnetism and Magnetic Materials
- Volume
- 431
- Pages
- 141-144
- No. of pages
- 4
- ISSN
- 0304-8853
- DOI
- https://doi.org/10.1016/j.jmmm.2016.09.119
- Publication date
- 06-2017
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103017 Magnetism, 210004 Nanomaterials
- Keywords
- ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials, Condensed Matter Physics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/925b417f-c409-4fc2-b3f7-17e654c0a8b8