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

Autor(en)
Alexey O. Ivanov, S. S. Kantorovich, Ekaterina A. Elfimova, Vladimir S. Zverev, Julien O. Sindt, Philip J. Camp
Abstrakt

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(en)
Computergestützte Physik und Physik der Weichen Materie
Externe Organisation(en)
Ural Federal University, University of Edinburgh
Journal
Journal of Magnetism and Magnetic Materials
Band
431
Seiten
141-144
Anzahl der Seiten
4
ISSN
0304-8853
DOI
https://doi.org/10.1016/j.jmmm.2016.09.119
Publikationsdatum
06-2017
Peer-reviewed
Ja
ÖFOS 2012
103017 Magnetismus, 210004 Nanomaterialien
Schlagwörter
ASJC Scopus Sachgebiete
Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/925b417f-c409-4fc2-b3f7-17e654c0a8b8