Enhancing the magnetic anisotropy of maghemite nanoparticles via the surface coordination of molecular complexes

Yoann Prado (), Niéli Daffé, Aude Michel, Thomas Georgelin, Nader Yaacoub, Jean-Marc Grenèche, Fadi Choueikani, Edwige Otero, Philippe Ohresser, Marie-Anne Arrio, Christophe Cartier-dit-Moulin, Philippe Sainctavit, Benoit Fleury, Vincent Dupuis, Laurent Lisnard () and Jérôme Fresnais ()
Additional contact information
Yoann Prado: Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, CNRS
Niéli Daffé: Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, CNRS
Aude Michel: Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, CNRS
Thomas Georgelin: Sorbonne Universités, UPMC Univ Paris 06, UMR 7197, LRS
Nader Yaacoub: Institut des Molécules et Matériaux du Mans CNRS UMR-6283, Université du Maine
Jean-Marc Grenèche: Institut des Molécules et Matériaux du Mans CNRS UMR-6283, Université du Maine
Fadi Choueikani: Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin—BP 48
Edwige Otero: Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin—BP 48
Philippe Ohresser: Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin—BP 48
Marie-Anne Arrio: Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR 7590, CNRS, UPMC, IRD, MNHN
Christophe Cartier-dit-Moulin: Sorbonne Universités, UPMC Univ Paris 06, UMR 8232, IPCM
Philippe Sainctavit: Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR 7590, CNRS, UPMC, IRD, MNHN
Benoit Fleury: Sorbonne Universités, UPMC Univ Paris 06, UMR 8232, IPCM
Vincent Dupuis: Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, CNRS
Laurent Lisnard: Sorbonne Universités, UPMC Univ Paris 06, UMR 8232, IPCM
Jérôme Fresnais: Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, CNRS

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Superparamagnetic nanoparticles are promising objects for data storage or medical applications. In the smallest—and more attractive—systems, the properties are governed by the magnetic anisotropy. Here we report a molecule-based synthetic strategy to enhance this anisotropy in sub-10-nm nanoparticles. It consists of the fabrication of composite materials where anisotropic molecular complexes are coordinated to the surface of the nanoparticles. Reacting 5 nm γ-Fe2O3 nanoparticles with the [CoII(TPMA)Cl2] complex (TPMA: tris(2-pyridylmethyl)amine) leads to the desired composite materials and the characterization of the functionalized nanoparticles evidences the successful coordination—without nanoparticle aggregation and without complex dissociation—of the molecular complexes to the nanoparticles surface. Magnetic measurements indicate the significant enhancement of the anisotropy in the final objects. Indeed, the functionalized nanoparticles show a threefold increase of the blocking temperature and a coercive field increased by one order of magnitude.

Date: 2015
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DOI: 10.1038/ncomms10139

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