Use of a powder composition and a medium
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United States of America Patent
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Issued Date -
Feb 21, 2008
app pub date -
Aug 15, 2007
filing date -
Aug 16, 2006
priority date (Note) -
Abandoned
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Abstract
The invention relates to the use of a powder composition comprising at least 95% by weight of magnetite (Fe.sub.3O.sub.4) particles as a magnetisable component in a medium for magnetically storing information. At least 99.9% by weight of the magnetite particles have a particle size of less than 5 .mu.m, and the magnetite particles have a polyhedral shape and essentially isotropic magnetic properties. The magnetite particles have a saturation magnetisation of 75-95 emu/g at 10 kOe, a remanence of 20-40 emu/g and a coercivity of 250-500 Oe. The invention also relates to the medium for magnetically storing information comprising magnetite particles.
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