FePt magnet and manufacturing method thereof
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United States of America Patent
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Dec 23, 2003
Grant Date -
Oct 24, 2002
app pub date -
Mar 4, 2002
filing date -
Mar 2, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention offers a minute-sized magnet with superior magnetic energy product (BH).sub.max and coercivity iHc, as well as superior anti-corrosive properties. This magnet is comprised of an alloy comprised of 35-55 atomic % platinum, 0.001-10 atomic % third element, which is one or more elements from groups IVa, Va, IIIb, or IVb, and a remainder of iron and other unavoidable impurities. The average crystal size of this FePt alloy is 0.3 .mu.m. By mixing an FePt alloy with a specific element in a designated ratio, an FePt magnet with more excellent characteristics than ones made from previous alloys was successfully made.
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