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

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 5nm g-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 nano- particles surface. Magnetic measurements indicate the significant enhancement of the ani- sotropy 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.
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Yoann Prado, Nielie Daffe,, Aude Michel, Thomas Georgelin, Nader Yaacoub, et al.. Enhancing the magnetic anisotropy of maghemite nanoparticles via the surface coordination of molecular complexes. Nature Communications, Nature Publishing Group, 2015, 6, pp.10139. ⟨10.1038/ncomms10139⟩. ⟨hal-01390543⟩

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