Structural evolution of some hard/soft magnetic heterostructures obtained by mechanical milling and annealing

Dominique Givord (1) , Ionel Chicinas (2) , Olivier Isnard (3) , Viorel Pop (4) , Jean Marie Le Breton (5)

1 NEEL - MNM - Micro et NanoMagnétisme
2 Technical University of Cluj-Napoca
3 NEEL - MRS - Matériaux, Rayonnements, Structure
4 UBB - Babes-Bolyai University [Cluj-Napoca]
5 GPM - Groupe de physique des matériaux

The influence of the milling and annealing conditions on the structural evolution of mechanically-milled SmCo5/alfa-Fe (20 and 30 wt %) and (Nd0.92Dy0.08)2Fe14B/ alfa -Fe(22 wt% ) nanocomposites has been studied. The structural evolution of the samples was followed by X-ray diffraction, electron microscopy and Mössbauer spectrometry. The width of the diffraction peaks increases with milling time, then the Bragg peaks almost disappear for high milling times. The characteristic diffractions peaks of the SmCo5-type phase are restored during subsequent heat treatment and the XRD patterns show also the presence of the Sm2(Co, Fe)17 phase induced by milling. XRD peaks of (Nd0.92Dy0.08)2Fe14B/ alfa -Fe composite can be attributed to R2Fe14B and alfa -Fe phases. No additional peaks were observed.

Mots clés: hard magnets; nanocomposites; mechanical milling

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

Dominique Givord, Ionel Chicinas, Olivier Isnard, Viorel Pop, Jean Marie Le Breton. Structural evolution of some hard/soft magnetic heterostructures obtained by mechanical milling and annealing. Journal of Optoelectronics and Advanced Materials, 2008, 10 (7), pp.1872-1876. ⟨hal-00312723⟩