Importance

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Abstract

Disclosed herein is a magnetic powder which can provide a magnet having excellent magnetic properties and having excellent reliability especially excellent 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 characterized in that, 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 remanent magnetic flux density Br[T] at the room temperature satisfies the relationship represented by the formula of Br/.rho.[x10.sup.-6 T.multidot.m.sup.3 /g].gtoreq.0.125; the irreversible susceptibility (.chi..sub.irr) of the isotropic bonded magnet which is measured by using an intersectioning point of a demagnetization curve in the J-H diagram representing the magnetic properties 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.times.10.sup.-6 H/m as a starting point is equal to or less than 5.0.times.10.sup.-7 H/m; and the intrinsic coercive force (H.sub.CJ) of the isotropic bonded magnet at the room temperature is in the range of 320-720 kA/m.

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First Claim