Magnetic powder for magnetic recording medium

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United States of America Patent

PATENT NO 11894171
APP PUB NO 20200161035A1
SERIAL NO

16683301

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Abstract

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Provided is an Al-containing hexagonal ferrite magnetic powder which produces an excellent durability-improving effect on a magnetic recording medium, wherein uniform pulverization of the magnetic powder can be easily achieved by dispersion treatment in preparation of a magnetic coating material even in cases where the magnetic powder has a small primary particle size or has a composition which is likely to produce hard secondary particles. The magnetic powder for a magnetic recording medium is an Al-containing hexagonal ferrite magnetic powder having an Al/Fe molar ratio of 0.030 to 0.200, and has a particle size distribution in which the volume ratio of particles having a particle size of 30 μm or more as measured by a laser diffraction particle size distribution analyzer with a dispersion pressure of 100 kPa is 5.0% or less, and an activation volume Vact of 1800 nm3 or less.

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Patent Owner(s)

Patent OwnerAddress
FUJIFILM CORPORATIONTOKYO 106-8620
DOWA ELECTRONICS MATERIALS CO LTDCHIYODA-KU TOKYO 101-0021

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kaneda, Shuji Tokyo, JP 8 61
Omoto, Hirohisa Tokyo, JP 8 113
Shiki, Satoshi Tokyo, JP 8 90
Suzuki, Hiroyuki Kanagawa, JP 847 10497
Tada, Toshio Kanagawa, JP 50 3320

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