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The interplay between single particle anisotropy and interparticle interactions in ensembles of magnetic nanoparticles
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
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2018 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 20, p. 28634-28643Article in journal (Refereed) Published
Abstract [en]

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 (D-TEM approximate to 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.

Place, publisher, year, edition, pages
Royal Society of Chemistry , 2018. Vol. 20, p. 28634-28643
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Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-365255DOI: 10.1039/C8CP03934HISI: 000451089900024OAI: oai:DiVA.org:uu-365255DiVA, id: diva2:1262527
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Swedish Research CouncilAvailable from: 2018-11-12 Created: 2018-11-12 Last updated: 2019-01-28Bibliographically approved

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Muscas, GiuseppeMathieu, Roland

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