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Issue 15, 2016
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Revealing the signature of dipolar interactions in dynamic spectra of polydisperse magnetic nanoparticles

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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.

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

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Publication details

The article was received on 29 Oct 2015, accepted on 03 Feb 2016 and first published on 04 Feb 2016


Article type: Paper
DOI: 10.1039/C5SM02679B
Citation: Soft Matter, 2016,12, 3507-3513
  • Open access: Creative Commons BY license
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    Revealing the signature of dipolar interactions in dynamic spectra of polydisperse magnetic nanoparticles

    A. O. Ivanov, V. S. Zverev and S. S. Kantorovich, Soft Matter, 2016, 12, 3507
    DOI: 10.1039/C5SM02679B

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