Theory of the dynamic magnetic susceptibility of ferrofluids

Alexey O. Ivanov, Philip J. Camp

Research output: Contribution to journalArticlepeer-review

Abstract

The dynamic magnetic response of a ferrofluid to a weak ac magnetic field is studied using new statistical mechanical theory and Brownian dynamics simulations, taking account of dipole-dipole interactions between the constituent ferromagnetic colloidal particles, and the presence of a range of particle sizes. The effects of interactions and polydispersity on the frequency dispersion are shown to be substantial: the amplitude of the response can be about twice that of a noninteracting system; the frequency for peak power loss can be reduced by about one half; and polydispersity effects can even change the qualitative appearance of the susceptibility spectrum.
Original languageEnglish
JournalPhysical Review E
Volume98
Issue number5
Early online date20 Nov 2018
DOIs
Publication statusE-pub ahead of print - 20 Nov 2018

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