POUDRES METALLIQUES FERROMAGNETIQUES UTILES A L'ENREGISTREMENT MAGNETIQUE, PROCEDES DE PRODUCTION DE CES POUDRES METALLIQUES ET SUPPORTS D'ENREGISTREMENT QUI EN SONT PREPARES

摘要

Ferromagnetic Fe-Ni alloy powders having the combination of a coercive force of 550-900 Oe (oersted) and a saturation flux density of 90-170 emu/g are provided by applying a nickel compound in a liquid to a particulate, oxygen-containing iron compound having an average particle length of 0.5-5 mu m and an average particle width of 0.02-0.5 mu m, and then drying and reducing the treated material to produce a metallic powder. The ferromagnetic powders are suitable for production of magnetic recording media because of the balanced magnetic properties.