Varying the exchange interaction between NiO nanoparticles

Christian Robert Haffenden Bahl; Steen Mørup

doi:10.1088/0957-4484/17/12/001

Varying the exchange interaction between NiO nanoparticles

Christian Robert Haffenden Bahl
, Steen Mørup

Research output: Contribution to journal › Journal article › Research › peer-review

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 language	English
Journal	Nanotechnology
Volume	17
Issue number	12
Pages (from-to)	2835-2839
ISSN	0957-4484
DOIs	https://doi.org/10.1088/0957-4484/17/12/001
Publication status	Published - 2006

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AB - 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.

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Varying the exchange interaction between NiO nanoparticles

Abstract

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