Phase transitions in a ferrofluid at magnetic-field-induced microphase separation

被引:42
|
作者
Lacoste, D [1 ]
Lubensky, TC [1 ]
机构
[1] Univ Penn, Dept Phys, Philadelphia, PA 19104 USA
来源
PHYSICAL REVIEW E | 2001年 / 64卷 / 04期
关键词
D O I
10.1103/PhysRevE.64.041506
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
In the presence of a magnetic field applied perpendicular to a thin sample layer, a suspension of magnetic colloidal particles (ferrofluid) can form spatially modulated phases with a characteristic length determined by the competition between dipolar forces and short-range forces opposing density variations. We introduce models for thin-film ferrofluids in which magnetization and particle density are viewed as independent variables and in which the nonmagnetic properties of the colloidal particles are described either by a lattice-gas entropy or by the Carnahan-Starling free energy. Our description is particularly Well suited to the low-particle-density regions studied in many experiments. Within mean-field theory, we find isotropic, hexagonal and stripe phases, separated in general by first-order phase boundaries.
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页数:8
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