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