Numéro
J. Phys. IV France
Volume 02, Numéro C3, Décembre 1992
35 ème Colloque de Métallurgie de l'INSTN
MATERIAUX MAGNETIQUES
PROGRES ET PERSPECTIVES
Page(s) C3-23 - C3-28
DOI http://dx.doi.org/10.1051/jp4:1992303
35 ème Colloque de Métallurgie de l'INSTN
MATERIAUX MAGNETIQUES
PROGRES ET PERSPECTIVES

J. Phys. IV France 02 (1992) C3-23-C3-28

DOI: 10.1051/jp4:1992303

Nouvelle méthode de synthèse et propriétés de ferrite spinelle pour enregistrement magnétooptique réinscriptible

J. OSTORÉRO1, H. LE GALL2, M. ESCORNE1, F. SOULETTE2 and A. PERCHERON-GUEGAN1

1  Laboratoire de Chimie Métallurgique des Terres Rares, CNRS, 1 Place A. Briand, 92195 Meudon cedex, France
2  Laboratoire de Magnétisme et Matériaux Magnétiques, CNRS, 1 Place A. Briand, 92195 Meudon cedex, France


Abstract
Cobalt ferrite spinels films have been synthesized by oxidizing at different temperatures of a metallic alloy film CoFe2. This metallic film is deposited on glass substrates by sputtering of a Fe target covered by Co platelets. X ray diffraction data and electron microprobe analysis show that the spinel phase CoFe2O4begins to form at 300 °C and crystallizes at higher temperatures. No preferential orientation was observed on glass substrates. Magnetic and magneto-optic properties (Faraday rotation (FR)) are a function of the oxidizing temperature Tox and particularly at 632.8 nm, FR are strongly related to the distribution of the Co2+ ions in the different sites of the spinel structure. Films prepared at Tox < 600 °C present properties close to those of bulk CoFe2O4. The high FR of the films indicate that this method could be used to synthesize Co ferrite spinel derived compounds as MO recording media.



© EDP Sciences 1992