SPONTANEOUS MAGNETIC ORDER IN STRONGLY COUPLED FERROFLUIDS

被引:39
作者
ZHANG, H [1 ]
WIDOM, M [1 ]
机构
[1] CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213
基金
美国国家科学基金会;
关键词
D O I
10.1016/0304-8853(93)91053-A
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Using the dipolar hard-sphere fluid as a model, we study the spontaneous magnetization of ferrofluids. Mean field theory suggests magnetic order will occur in a strongly coupled ferrofluid. At fixed low density, the system phase separates at low temperature into a dilute nonmagnetic gas and a dense. magnetically ordered liquid. We focus our study on the effect of positional randomness, which is not included in conventional mean field studies. Our results show that a positionally unstructured ferrofluid exhibits magnetic order at low temperatures, provided its density is high enough. Freezing the solvent inhibits phase separation. In this case, positional randomness prevents magnetic order in a dilute frozen ferrofluid.
引用
收藏
页码:119 / 122
页数:4
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