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

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 FokkerPlanck equation, which takes into account dipoledipole interaction in the form of the first o...

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Bibliographic Details
Published in:Soft matter 2016-04, Vol.12 (15), p.357-3513
Main Authors: Ivanov, Alexey O, Zverev, Vladimir S, Kantorovich, Sofia S
Format: Article
Language:English
Subjects:
Dynamic tests
Dynamics
Exact solutions
Mathematical analysis
Nanoparticles
Perturbation methods
Signatures
Spectra
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Summary: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 FokkerPlanck equation, which takes into account dipoledipole 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. We investigate, via a modified mean field approach, the dynamic magnetic response of a polydisperse dipolar suspension to a weak, linearly polarised, AC field.
ISSN:1744-683X
1744-6848
DOI:10.1039/c5sm02679b