Importance

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Abstract

Disclosed herein is a magnetic powder which can provide a bonded magnet having excellent magnetic properties and having excellent reliability especially excellent heat stability. The magnetic powder is composed of an alloy composition represented by R.sub.x (Fe.sub.1-y Co.sub.y).sub.100-x-z-w B.sub.z Al.sub.w (where R is at least one kind of rare-earth element, x is 7.1-9.9 at %, y is 0-0.30, z is 4.6-6.9 at %, and w is 0.02-1.5 at %), 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 having a density .rho.[Mg/m.sup.3 ] by mixing with a binding resin and then molding it, the maximum magnetic energy product (BH).sub.max [kJ/m.sup.3 ] of the bonded magnet at the room temperature satisfies the relationship represented by the formula (BH).sub.max /.rho..sup.2 [.times.10.sup.-9 J.multidot.m.sup.3 /g.sup.2 ].gtoreq.2.1, and the intrinsic coercive force (H.sub.CJ) of the bonded magnet at the room temperature is in the range of 320-720 kA/m.

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First Claim