Browse Prior Art Database

Process for Production of Magnetic Materials

IP.com Disclosure Number: IPCOM000086185D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Craig, DR: AUTHOR [+3]

Abstract

In U.S. Patents 3,899,369 and 3,954,520 methods of making magnetic cobalt-phosphorous particles suitable for use in high-density magnetic recording media are taught. They teach that production of cobalt-phosphorous particles by controlled chemical reduction in a DC magnetic field, consistently produces magnetic particles which are suitable for use in high-density magnetic recording.

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Process for Production of Magnetic Materials

In U.S. Patents 3,899,369 and 3,954,520 methods of making magnetic cobalt-phosphorous particles suitable for use in high-density magnetic recording media are taught. They teach that production of cobalt-phosphorous particles by controlled chemical reduction in a DC magnetic field, consistently produces magnetic particles which are suitable for use in high-density magnetic recording.

It has now been determined that in reaction systems of this type, the use of a nonuniform DC magnetic field has no adverse effect on the magnetic character of the particles produced. Indeed, it has been found that by utilizing a distorted magnetic field, the coercivity of the cobalt-phosphorous produced can be increased without any adverse effects upon the other magnetic characteristics of the particles. For example, a reaction system with a 1000 gauss field applied produces higher coercivity particles when it includes several areas having effective fields of 1400 to 1500 gauss applied. As already noted, the resulting particles exhibit no adverse effects in any of their other magnetic properties.

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