Revealing the signature of dipolar interactions in dynamic spectra of polydisperse magnetic nanoparticles

Autor(en)

Alexey O. Ivanov, Vladimir S. Zverev, Sofia Kantorovich

Abstrakt

We investigate, via a modified mean field approach, the dynamic magnetic response of a polydisperse dipolar suspension to a weak, linearly polarised, AC field. We introduce an additional term into the Fokker-Planck equation, which takes into account dipole-dipole interaction in the form of the first order perturbation, and allows for particle polydispersity. The analytical expressions, obtained for the real and imaginary dynamic susceptibilities, predict three measurable effects: the increase of the real part low-frequency plateaux; the enhanced growth of the imaginary part in the low-frequency range; and the shift of the imaginary part maximum. Our theoretical predictions find an experimental confirmation and explain the changes in the spectrum.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie

Externe Organisation(en)

Ural Federal University

Journal

Soft Matter

Band

12

Seiten

3507-3513

Anzahl der Seiten

7

ISSN

1744-683X

DOI

https://doi.org/10.1039/c5sm02679b

Publikationsdatum

02-2016

Peer-reviewed

Ja

ÖFOS 2012

103023 Polymerphysik, 103006 Chemische Physik

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Allgemeine Chemie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/0828a70f-f194-4cd7-a345-c4efe8f3d665