Revealing the signature of dipolar interactions in dynamic spectra of polydisperse magnetic nanoparticles
- Author(s)
- Alexey O. Ivanov, Vladimir S. Zverev, Sofia Kantorovich
- Abstract
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(s)
- Computational and Soft Matter Physics
- External organisation(s)
- Ural Federal University
- Journal
- Soft Matter
- Volume
- 12
- Pages
- 3507-3513
- No. of pages
- 7
- ISSN
- 1744-683X
- DOI
- https://doi.org/10.1039/c5sm02679b
- Publication date
- 02-2016
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103023 Polymer physics, 103006 Chemical physics
- Keywords
- ASJC Scopus subject areas
- Condensed Matter Physics, General Chemistry
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/0828a70f-f194-4cd7-a345-c4efe8f3d665