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Issue 45, 2018
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The interplay between single particle anisotropy and interparticle interactions in ensembles of magnetic nanoparticles

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Abstract

This paper aims to analyze the competition of single particle anisotropy and interparticle interactions in nanoparticle ensembles using a random anisotropy model. The model is first applied to ideal systems of non-interacting and strongly dipolar interacting ensembles of maghemite nanoparticles. The investigation is then extended to more complex systems of pure cobalt ferrite CoFe2O4 (CFO) and mixed cobalt–nickel ferrite (Co,Ni)Fe2O4 (CNFO) nanoparticles. Both samples were synthetized by the polyol process and exhibit the same particle size (DTEM ≈ 5 nm), but with different interparticle interaction strengths and single particle anisotropy. The implementation of the random anisotropy model allows investigation of the influence of single particle anisotropy and interparticle interactions, and sheds light on their complex interplay as well as on their individual contribution. This analysis is of fundamental importance in order to understand the physics of these systems and to develop technological applications based on concentrated magnetic nanoparticles, where single and collective behaviors coexist.

Graphical abstract: The interplay between single particle anisotropy and interparticle interactions in ensembles of magnetic nanoparticles

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Supplementary files

Article information


Submitted
21 Jun 2018
Accepted
25 Oct 2018
First published
08 Nov 2018

This article is Open Access

Phys. Chem. Chem. Phys., 2018,20, 28634-28643
Article type
Paper

The interplay between single particle anisotropy and interparticle interactions in ensembles of magnetic nanoparticles

G. Muscas, G. Concas, S. Laureti, A. M. Testa, R. Mathieu, J. A. De Toro, C. Cannas, A. Musinu, M. A. Novak, C. Sangregorio, S. S. Lee and D. Peddis, Phys. Chem. Chem. Phys., 2018, 20, 28634
DOI: 10.1039/C8CP03934H

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    [Original citation] - Published by The Royal Society of Chemistry.

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