Hexagonal ferrite magnetic powder, process for producing the same, and magnetic recording medium
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United States of America Patent
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Issued Date -
Dec 22, 2005
app pub date -
Jun 21, 2005
filing date -
Jun 21, 2004
priority date (Note) -
Abandoned
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Abstract
A hexagonal ferrite magnetic powder having an average tabular diameter of from 15 to 30 nm, an average tabular ratio of from 3.0 to 4.9, an Hc of from 2,020 to 5,000 Oe (from 161.6 to 400 kA/m) and an SFD of from 0.3 to 0.7, and comprising at least one tetravalent element in a proportion of from 0.004 to 0.045 atoms based on one atom of Fe.
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