| 摘要 |
Disclosed herein is a magnetic powder which can provide a magnet having excellent magnetic properties and having excellent reliability especially excellent in heat stability. The magnetic powder is composed of an alloy composition represented by Rx(Fe1-yCoy)100-x-z-w-vBzAlwVv (where R is at least one kind of rare-earth element, x is 7.1 - 9.9at%, y is 0 - 0.30, z is 4.6 - 6.9at%, w is 0.02 - 1.5at% and v is 0.2 - 3.5at%), the magnetic powder being constituted from a composite structure having a soft magnetic phase and a hard magnetic phase, wherein the magnetic powder has magnetic properties in which, when the magnetic powder is formed into an isotropic bonded magnet by mixing with a binding resin and then molding it, the irreversible susceptibility ( chi irr) which is measured by using an intersectioning point of a demagnetization curve in the J-H diagram representing the magnetic characteristics at the room temperature and a straight line which passes the origin in the J-H diagram and has a gradient (J/H) of -3.8 x 10<-6>H/m as a starting point is less than 5.0 x 10<-7>H/m, and the intrinsic coercive force (HCJ) of the bonded magnet at the room temperature is in the range of 320 - 720 kA/m. <IMAGE>
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