Magnetic material
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United States of America Patent
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Mar 27, 2007
Grant Date -
Dec 4, 2003
app pub date -
Feb 24, 2003
filing date -
Mar 5, 1999
priority date (Note) -
Expired
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Abstract
Magnetic materials having a coercivity not less than about 1000 Oersted are prepared in a single step procedure. A molten mixture of a desired composition having a relatively high boron content is cooled at a rate slower than about 10.sup.5 degrees Celsius per second. Preferably, the molten mixture is cooled by depositing it on a chilled surface such that it forms a layer between about 120 and about 300, and preferably between about 120 and about 150, microns thick.
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