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

Niéli Daffé; Fadi Choueikani; Sophie Neveu; Marie-Anne Arrio; Amélie Juhin ⁠; Philippe Ohresser; Vincent Dupuis; Philippe Sainctavit

doi:10.1016/j.jmmm.2018.03.041

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 : Nanoparticle Magnetic anisotropies Spinels

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Chemical Sciences

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