Molecule-Driven Control of the Magnetic Anisotropy of Surface-Functionalized Maghemite Nanoparticles

Using cobalt(II) complexes and a simple coordination reaction at the surface of maghemite nanoparticles, molecule-driven control of the effective magnetic anisotropy can be achieved. This functionalization strategy is explored for nanoparticles ranging from 4 to 8 nm and performed under soft synthetic conditions (mild temperature and in air) and in aqueous media. It preserves colloidal stability and permits an acute control of the magnetic properties with an increase in the blocking temperature and of the coercive field values. This effect is correlated to the quantity of complexes coordinated at the surface and the increase in the surface anisotropy of the nanoparticles. Magnetometry studies show that the effective magnetic anisotropy constant, Keff, can be modulated from 32 to 168 kJ·m–3 and with a few kJ·m–3 accuracy.

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Publication Details

Journal
Chemistry of Materials
Published
2026-01-20
DOI
https://doi.org/10.1021/acs.chemmater.5c02831
Primary Topic
Magnetism in coordination complexes
Type
article
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article

Molecule-Driven Control of the Magnetic Anisotropy of Surface-Functionalized Maghemite Nanoparticles

Laurent Lisnard, Benoît Fleury, Benoı̂t Baptiste, Yoann Prado et al.
Chemistry of Materials
Magnetism in coordination complexes
article

Molecule-Driven Control of the Magnetic Anisotropy of Surface-Functionalized Maghemite Nanoparticles

Laurent Lisnard, Benoît Fleury, Benoı̂t Baptiste, Yoann Prado, D. Hrabovsky, Leonardo Curti, Yanling Li, V. Dupuis, Jérôme Fresnais, Aude Michel
article en

Abstract

Using cobalt(II) complexes and a simple coordination reaction at the surface of maghemite nanoparticles, molecule-driven control of the effective magnetic anisotropy can be achieved. This functionalization strategy is explored for nanoparticles ranging from 4 to 8 nm and performed under soft synthetic conditions (mild temperature and in air) and in aqueous media. It preserves colloidal stability and permits an acute control of the magnetic properties with an increase in the blocking temperature and of the coercive field values. This effect is correlated to the quantity of complexes coordinated at the surface and the increase in the surface anisotropy of the nanoparticles. Magnetometry studies show that the effective magnetic anisotropy constant, Keff, can be modulated from 32 to 168 kJ·m–3 and with a few kJ·m–3 accuracy.

Chemistry of MaterialsVol. 38(3)
Centre National de la Recherche Scientifique (FR), Sorbonne Université (FR), Institut des NanoSciences de Paris (FR), PHENIX laboratory (FR), Sorbonne University Abu Dhabi (AE), Institut de minéralogie, de physique des matériaux et de cosmochimie (FR), Institut Parisien de Chimie Moléculaire (FR), Joint Institute for High Temperatures (RU), Institut de Recherche pour le Développement (FR), Laboratoire Médiations (FR), Université Paris 1 Panthéon-Sorbonne (FR)
Openalex Percentile: Top 83%
Magnetism in coordination complexes
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Molecule-Driven Control of the Magnetic Anisotropy of Surface-Functionalized Maghemite Nanoparticles — Laurent Lisnard, Benoît Fleury, et al. · Chemistry of Materials (2026) | TGRS Research Map | TGRS