Permanent magnet including multiple ferromagnetic phases and method for producing the magnet
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United States of America Patent
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Nov 20, 2007
Grant Date -
Jul 15, 2004
app pub date -
Dec 24, 2003
filing date -
May 24, 2000
priority date (Note) -
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Abstract
An iron-based rare earth alloy magnet has a composition represented by the general formula: (Fe.sub.1-mT.sub.m).sub.100-x-y-zQ.sub.xR.sub.yM.sub.z, where T is at least one element selected from the group consisting of Co and Ni; Q is at least one element selected from the group consisting of B and C; R is at least one rare earth element substantially excluding La and Ce; and M is at least one metal element selected from the group consisting of Ti, Zr and Hf and always includes Ti. In this formula, the mole fractions x, y, z and m meet the inequalities of: 10 at %
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