Magnetic and structural properties of SmCo5/alpha-Fe nanocomposites

Dominique Givord (1) , Viorel Pop (2) , Olivier Isnard (3) , Ionel Chicinas (4)

1 NEEL - MNM - Micro et NanoMagnétisme
2 UBB - Babes-Bolyai University [Cluj-Napoca]
3 NEEL - MRS - Matériaux, Rayonnements, Structure
4 Technical University of Cluj-Napoca

SmCo5/alfa-Fe magnetic nanocomposites have been obtained by mechanical milling in a planetary mill and subsequent annealing. Under all experimental conditions, only the pure SmCo5 phase and the alfa -Fe one were observed by X-ray diffraction. In the as-milled state, a significant remanence-enhancement effect is already found in a reference sample made of SmCo5 nanograins. In nanocomposites, the coercive field, µ0Hc, is below 0.1 T. After annealing, coercivity develops, up to a maximum value µ0Hc = 0.36T under optimal conditions. The associated remanent magnetization reaches 69Am2/kg.

Mots clés: Hard magnets; Nanocomposite; Spring magnets; Magnetization; Mechanical milling

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Dominique Givord, Viorel Pop, Olivier Isnard, Ionel Chicinas. Magnetic and structural properties of SmCo5/alpha-Fe nanocomposites. Journal of Magnetism and Magnetic Materials, 2007, 310, pp.2489-2490. ⟨10.1016/j.jmmm.2006.11.090⟩. ⟨hal-00312691⟩