期刊
SOFT MATTER
卷 12, 期 15, 页码 3507-3513出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sm02679b
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资金
- Russian Science Foundation [15-12-10003]
- FWF START-Projekt [Y 627-N27]
- EU [642774]
- Russian Science Foundation [15-12-10003] Funding Source: Russian Science Foundation
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.
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