Superparamagnetic nanoparticle ensembles

Details Superparamagnetic nanoparticle ensembles Superparamagnetic nanoparticle ensembles

2009-11-20

arxiv.org/abs/0911.4031v1

Superlatt. Microstr. 47, 569 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Magnetic single-domain nanoparticles constitute an important model system in magnetism. In particular ensembles of superparamagnetic nanoparticles can exhibit a rich variety of different behaviors depending on the inter-particle interactions. Starting from isolated single-domain ferro- or ferrimagnetic nanoparticles the magnetization behavior of both non-interacting and interacting particle-ensembles is reviewed. A particular focus is drawn onto the relaxation time of the system. In case of interacting nanoparticles the usual Neel-Brown relaxation law becomes modified. With increasing interactions modified superparamagnetism, spin glass behavior and superferromagnetism is encountered.

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