Varying the exchange interaction between NiO nanoparticles

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Abstract

We demonstrate that exchange interactions between antiferromagnetic nanoparticles of 57Fe-doped NiO can be varied by simple macroscopic treatments. Mössbauer spectroscopy studies of the superparamagnetic relaxation behaviour show that grinding or suspension in water of nanoparticles of NiO can significantly reduce interparticle interactions. Slow drying of aqueous suspensions of NiO nanoparticles did not lead to enhanced interparticle interactions. This is opposite to the behaviour of α-Fe2O3 (hematite) nanoparticles.

Original languageEnglish
JournalNanotechnology
Volume17
Issue number12
Pages (from-to)2835-2839
ISSN0957-4484
DOIs
Publication statusPublished - 2006

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