Hexagonal ferrite magnetic powder, method for producing the same and magnetic recording medium
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United States of America Patent
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Jun 3, 2008
Grant Date -
Jan 25, 2007
app pub date -
Jun 20, 2005
filing date -
Jun 21, 2004
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Abstract
A hexagonal ferrite magnetic powder having an average tabular diameter of from 15 to 28 nm, a coercive force (Hc) of from 2,000 to 5,000 Oe (from 160 to 400 kA/m), a switching field distribution (SFD) of from 0.3 to 0.7 and a D70/D50 of from 1.05 to 1.25. This magnetic powder can be obtained by melting and quenching starting materials to obtain an amorphous product, and thermally treating the product, which comprises increasing a temperature at a rate of 300 to 500.degree. C./hr in a temperature range of 550 to 600.degree. C. in the thermal treatment before the temperature reaches the thermally treating temperature.
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