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Method for Increasing the Lubricant Retention of Particulate Media for Magnetic Recording

IP.com Disclosure Number: IPCOM000037706D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Lee, DK: AUTHOR [+4]

Abstract

Particulate media composed of magnetic hexagonal ferrites such as barium ferrite show improved magnetic and mechanical properties compared to conventional recording media.

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Method for Increasing the Lubricant Retention of Particulate Media for Magnetic Recording

Particulate media composed of magnetic hexagonal ferrites such as barium ferrite show improved magnetic and mechanical properties compared to conventional recording media.

The use in a magnetic coating of barium ferrite, which due to their hexagonal platelet structure and surface chemistry, results in additional microvoid formation and a stronger interaction with fluorocarbon lubricant compared with acicular magnetic pigments including iron oxide, cobalt surface modified iron oxides, etc. This results in the desired increase in lubricant retention and the desired spatial distribution of lubricant in the bulk of the coating for extended disk file operation. The mechanical properties of the media composed of hexagonal ferrites are improved compared to conventional media. The concentration of barium ferrite in the coating comprises 1 to 99 weight percent of the total magnetic particles in the magnetic coating. Media can be prepared by mixing two or more types of particles including magnetic hexagonal ferrites, in particular barium ferrite, with acicular magnetic recording pigments, qFe2O3, Co-qFe2O3, alternative forms of cobalt modified iron oxide, iron particles, particle alloys of iron, cobalt, nickel, etc., and chromium dioxide.

Barium ferrite media and media composed of mixtures of barium ferrite and Co-qFe2O3 particles show improved magnetic and recording properties compar...