Magnetic interactions between nanoparticles

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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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.
Original languageEnglish
JournalBeilstein Journal of Nanotechnology
Publication date2010
Volume1
Pages182-190
ISSN2190-4286
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 64
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