| 摘要 |
Disclosed herein is a magnetic powder which can provide magnets having excellent magnetic properties and having excellent reliability especially excellent heat stability. The magnetic powder is composed of an alloy composition represented by Rx(Fe1-aCoa)100-x-y-zByMz (where R is at least one kind of rare-earth element excepting Dy, M is at least one kind of element selected from Ti, Cr, Nb, Mo, Hf, W, Mn, Zr and Dy, x is 7.1-9.9 at %, y is 4.6-8.0 at %, z is 0.1-3.0 at %, and a is 0-0.30, and the magnetic powder being constituted from a composite structure having a soft magnetic phase and a hard magnetic phase, wherein when the magnetic powder is mixed with a binding resin and then the mixture is subjected to compaction molding to form a bonded magnet having a density rho[Mg/m<3>], the maximum magnetic energy product (BH)max[kJ/m<3>] of the bonded magnet at a room temperature satisfies the relationship represented by the formula (BH)max/rho<2>[x10<-9 >Jm<3>/g<2>]2.40, and the intrinsic coercive force HCJ of the bonded magnet at a room temperature is in the range of 400-750 kA/m.
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