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Studying the interfacial exchange coupling within ferrite based magnetic nanoparticles prepared following to a succession of thermal decomposition synthesis

Abstract : The use of rare earths in data storage devices is expensive and polluting. Their replacement with iron oxide would make it possible to avoid this. Below a size of 20 nm, iron oxide nanoparticles cannot be considered as permanent magnet. An alternative is to combine them with another magnetic phase to enhance their magnetic anisotropy via interfacial exchange coupling within core@shell nanoparticles. However, the magnetic stability of the latter remains insufficient. The scope of this thesis is to design a new type of magnetic nanoparticles of core@shell@shell structure with a Fe3-dO4 core and CoFe2O4, CoO or NiO as shells which has further enhance the magnetic properties while maintaining a size below 18 nm. The in-depth study of their structure-properties relationship was carried out using a wide set of analytical techniques.
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Kevin Sartori. Studying the interfacial exchange coupling within ferrite based magnetic nanoparticles prepared following to a succession of thermal decomposition synthesis. Materials. Université de Strasbourg, 2019. English. ⟨NNT : 2019STRAE029⟩. ⟨tel-02470768⟩

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