Magnetic powder for magnetic recording
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United States of America Patent
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Jul 11, 2006
Grant Date -
Sep 11, 2003
app pub date -
Mar 5, 2003
filing date -
Mar 7, 2002
priority date (Note) -
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Abstract
A magnetic powder for magnetic recording is provided that has improved properties suitable for a magnetic recording medium used with a high-sensitivity read head utilizing an MR device. The magnetic powder is composed of iron-base acicular particles containing Co, Al, R (rare earth elements, including Y) and oxygen within the ranges of Co/Fe=10 50 at. %, dissolved Al/(Fe+Co)=5 50 at. %, R/(Fe+Co)=2 25 at. % and oxygen=not greater than 25 wt %; and the acicular particles have an average major axis length of 25 80 nm and a saturated magnetization .sigma.s of 10 130 emu/g,
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