MAGNETIC PROPERTIES OF NANOCOMPOSITE Sm2Co17-Cu

L. Bessais1,2*, J. X. Zhang1, C. Djéga-Mariadassou1, A. Percheron-Guégan1

1 LCMTR, UPR 209, CNRS, 2/8 rue Henri Dunant B.P. 28, F-94320 Thiais, France

2 IUFM de Créteil, F-94861 Bonneuil sur Marne, France

* Corresponding author. E-mail : bessais@glvt-cnrs.fr

Received : 03 May 2002; revised version accepted : 27 June 2003

Abstract

Nanocomposite Sm2Co17-Cu particles have been fabricated by low energy co-milling of mechanically alloyed Sm2Co17 particles with Cu nanoparticles. The x-ray diffraction analyses show that the diffraction crystallite size (DCS) of Sm2Co17 decreases with increasing co-milling time. Scanning and transmission electron microscopy observation demonstrates that the particle size is in the range of the DCS and the Sm2Co17 particles are separated by Cu particles. The coercivity as well as the remanence ratio decreases with increasing milling time due to he grain size reduction and grain separation. The nanocomposite Sm2Co17-Cu exhibits suitable magnetic and microstructure properties for high-density recording.

Keywords : Nanoparticles; Sm2Co17; Coercivity; High-density recording.

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