Concentration-dependent zero-field magnetic dynamic response of polydisperse ferrofluids

Autor(en)

A. O. Ivanov, S. S. Kantorovich, V. S. Zverev, A. V. Lebedev, A. F. Pshenichnikov, P. J. Camp

Abstrakt

In this contribution, we discuss the experimental results obtained for seven ferrofluid samples with the same particle size distribution that differ only in concentration of magnetic material. The dynamic response to a weak linearly-polarised probing AC field is measured for each sample at five different temperatures. We investigate Cole-Cole diagrams and phase shifts in order to describe the impact of ferroparticle concentration on the initial magnetic susceptibility. Our findings show that the main contribution comes from the increasing effective viscosity of the ferrofluid that results in the growth of the Brownian relaxation time. This mechanism is very important for the systems containing even a small portion of large magnetic colloids. The influence of dipolar correlations was separately analysed using computer simulations.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie

Externe Organisation(en)

Ural Federal University, Russian Academy of Sciences, University of Edinburgh

Journal

Journal of Magnetism and Magnetic Materials

Band

459

Seiten

252-255

Anzahl der Seiten

4

ISSN

0304-8853

DOI

https://doi.org/10.1016/j.jmmm.2017.10.089

Publikationsdatum

08-2018

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus, 103029 Statistische Physik

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/277bc2da-67e8-48b3-96f2-55d77d77465d