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Particulate media composed of magnetic hexagonal ferrites such as barium ferrite show improved magnetic and mechanical properties compared to conventional recording media.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
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Method for Increasing the Lubricant Retention of Particulate Media for
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