Theory of the dynamic magnetic susceptibility of ferrofluids

被引：47
作者：
Ivanov, Alexey O. [1 ]
Camp, Philip J. [1 ,2 ]
机构：
[1] Ural Fed Univ, Inst Nat Sci & Math, Dept Theoret & Math Phys, 51 Lenin Ave, Ekaterinburg 620000, Russia
[2] Univ Edinburgh, Sch Chem, David Brewster Rd, Edinburgh EH9 3FJ, Midlothian, Scotland
来源：
PHYSICAL REVIEW E | 2018年 / 98卷 / 05期
基金：
俄罗斯科学基金会;
关键词：
THERMAL FLUCTUATIONS;
D O I：
10.1103/PhysRevE.98.050602
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
The dynamic magnetic response of a ferrofluid to a weak ac magnetic field is studied using 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.
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页数：5
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