Magnetic anisotropies and cationic distribution in CoFe2O4 nanoparticles prepared by co-precipitation route: Influence of particle size and stoichiometry

Niéli Daffé 1 Fadi Choueikani Sophie Neveu Marie-Anne Arrio 1 Amélie Juhin 1 Philippe Ohresser 2 Vincent Dupuis 3 Philippe Sainctavit 1
1 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie
2 SSOLEIL - Synchrotron SOLEIL
3 PHENIX - PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX
Abstract : Magnetic anisotropies and crystallographic structures of iron-cobalt nanospinels obtained with the co-precipitation synthesis process are revealed using X-ray Absorption Spectroscopy and X-ray Magnetic Circular Dichroism. The chemical process allows to obtain nanoparticles of various sizes and chemical composition, but it is the site symmetry environment of Co2+ that is found to be the crucial parameter that governs the magnetic anisotropies of the nanospinels. The distribution of Co2+ among the crystallographic sites of the structure is directly linked to the temperature of the synthesis process. In parallel, the results also revealed that a superficial rich shell of iron is formed for the iron-cobalt nanospinels stable in acidic medium leading to chemically inhomogeneous nanoparticles.
Keywords : Spinels Nanoparticle Magnetic anisotropies
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Niéli Daffé, Fadi Choueikani, Sophie Neveu, Marie-Anne Arrio, Amélie Juhin, et al.. Magnetic anisotropies and cationic distribution in CoFe2O4 nanoparticles prepared by co-precipitation route: Influence of particle size and stoichiometry. Journal of Magnetism and Magnetic Materials, Elsevier, 2018, 460, pp.243 - 252. ⟨10.1016/j.jmmm.2018.03.041⟩. ⟨hal-01787282⟩

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