Magnetic interactions between nanoparticles

被引：301

作者：

Morup, Steen ^{[1
]}

Hansen, Mikkel Fougt ^{[2
]}

Frandsen, Cathrine ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark

[2] Tech Univ Denmark, DTU Nanotech, Dept Micro & Nanotechnol, DK-2800 Lyngby, Denmark

来源：

BEILSTEIN JOURNAL OF NANOTECHNOLOGY | 2010年 / 1卷

关键词：

dipole interactions; exchange interactions; spin structure; superferromagnetism; superparamagnetic relaxation; ELECTRON HOLOGRAPHY; DYNAMICS; RELAXATION; BLOCKING; BEHAVIOR;

D O I：

10.3762/bjnano.1.22

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We present a short overview of the influence of inter-particle interactions on the properties of magnetic nanoparticles. Strong magnetic dipole interactions between ferromagnetic or ferrimagnetic particles, that would be superparamagnetic if isolated, can result in a collective state of nanoparticles. This collective state has many similarities to spin-glasses. In samples of aggregated magnetic nanoparticles, exchange interactions are often important and this can also lead to a strong suppression of superparamagnetic relaxation. The temperature dependence of the order parameter in samples of strongly interacting hematite nanoparticles or goethite grains is well described by a simple mean field model. Exchange interactions between nanoparticles with different orientations of the easy axes can also result in a rotation of the sub-lattice magnetization directions.

引用

页码：182 / 190

页数：9

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