International Business Machines Corporation

Michael A Marchese

Thomas J Beaulieu

Franklin T Plante

Robert H Tlaskal

The problem of characterizing metallic magnetic particles as suitable or unsuitable for use in a high density magnetic recording media is believed to have been solved by use of a figure of merit designated as 'W/H.sub.c ', and defined herein. It has been found that metallic magnetic particles which exhibit a W/H.sub.c of about 1.2 or less offer the most desirable magnetic recording characteristics for high density magnetic recording media. With this characterization technique available, it has been determined that most quantities of metallic magnetic cobalt-phosphorus particles produced by chemical reduction have W/H.sub.c 's greater than 1.2, and are unsuitable for use in high density magnetic recording media. Using W/H.sub.c, it has been possible to recognize those metallic particles which are suitable for use in high density recording media, and to engage in experimentation to determine what methods of manufacturing are required for the production of suitable high density recording particles. Surprisingly, following the recognition of the problem, it has been found that production of cobalt-phosphorus particles by controlled chemical reduction in a D.C. magnetic field of at least about 200 gauss consistently produces magnetic particles having W/H.sub.c of about 1.2 or less. In the absence of a D.C. magnetic field of at least about 200 gauss, cobalt-phosphorus particles having a W/H.sub.c as low as 1.2 are rarely produced.

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Boulder, CO, United States of America

Michael A Marchese