Journal article
Magnetic interactions between nanoparticles
Department of Physics, Technical University of Denmark1
Magnetic Systems Group, LabChip Section, Department of Micro- and Nanotechnology, Technical University of Denmark2
LabChip Section, Department of Micro- and Nanotechnology, Technical University of Denmark3
Department of Micro- and Nanotechnology, Technical University of Denmark4
Surface Physics and Catalysis, Department of Physics, Technical University of Denmark5
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.
Language: | English |
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Publisher: | Beilstein-Institut |
Year: | 2010 |
Pages: | 182-190 |
ISSN: | 21904286 |
Types: | Journal article |
DOI: | 10.3762/bjnano.1.22 |
ORCIDs: | Hansen, Mikkel Fougt and Frandsen, Cathrine |