High Magnetic Moment of FeCo Nanoparticles Produced in Polyol Medium - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue IEEE Transactions on Magnetics Année : 2014

High Magnetic Moment of FeCo Nanoparticles Produced in Polyol Medium

Résumé

High magnetization Fe55Co45 alloy nanoparticles have been successfully synthesized by the polyol reduction process followed by annealing under argon. The diethylene glycol (DEG) was used as solvent and reducing agent simultaneously in this process. All the synthesized samples of FeCo nanoparticles were annealed at 873K for different times. The alloy formation processes, the evolution of the microstructure, and the magnetic properties have been investigated before and after samples annealing. The X-ray diffraction of the synthesized product before annealing shows that a cobalt ferrite is spinel structure of crystallite size of about 10 nm. X-ray diffraction analysis of the samples annealed at 873K for different times also shows that of the FeCo alloy has been obtained by reducing the cobalt ferrite. It has been confirmed the formation of a body-centered-cubic (bcc) single phase structure where the wt.% increases with annealing times leading to a pure phase after annealing during 4h. These results are confirmed by transmission electron microscopy study. The saturation magnetization of the Fe-Co alloys increases with annealing time, indicating an increasing homogeneity in composition and the single bcc FeCo phase formation. The highest saturation magnetization of 235 Am2.kg−1 with a low coercivity of 7.5 mT was obtained for the Fe55Co45 nanoparticles annealed during 4h. The anisotropy constant K has been extracted and we have shown that increases with the annealing time.
Fichier non déposé

Dates et versions

hal-00921153 , version 1 (19-12-2013)

Identifiants

Citer

Karim Zehani, R. Bez, Jacques Moscovici, Frederic Mazaleyrat, N. Mliki, et al.. High Magnetic Moment of FeCo Nanoparticles Produced in Polyol Medium. IEEE Transactions on Magnetics, 2014, 50 (4), pp.2002505. ⟨10.1109/TMAG.2013.2288411⟩. ⟨hal-00921153⟩
248 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More