Dynamic magnetic response of a ferrofluid in a static uniform magnetic field

被引：28

作者：

Batrudinov, Timur M. ^{[1
]}

Nekhoroshkova, Yuliya E. ^{[1
]}

Paramonov, Egor, I ^{[1
]}

Zverev, Vladimir S. ^{[1
]}

Elfimova, Ekaterina A. ^{[1
]}

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：

MEAN-FIELD; CONCENTRATED FERROCOLLOIDS; THERMAL FLUCTUATIONS; DIPOLAR INTERACTIONS; NANOPARTICLES; FLUIDS; HYPERTHERMIA; MEDIATORS; PARTICLE; LIQUIDS;

D O I：

10.1103/PhysRevE.98.052602

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：

A theory for the frequency-dependent magnetic susceptibility of a ferrofluid in a static uniform magnetic field is developed, including the dipolar interactions between the constituent particles. Interactions are included within the framework of modified mean-field theory. Predictions are given for the linear responses of the magnetization to a probing ac field both parallel and perpendicular to the static field and are tested against results from Brownian dynamics simulations. The effects of the particle concentration and dipolar coupling constant on the field-dependent static susceptibilities and the frequency dispersions are shown to be substantial, which justifies taking proper account of the interactions between particles. The theory is reliable provided that the volume concentration and dipolar coupling constant are not too large and within the range of values for real ferrofluids.

引用

页数：14

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