Magnetic powder and isotropic bonded magnet

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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 Rx(Fe1-yCoy)100-x-z-wBzNbw (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%, and w 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 having a density rho ÄMg/mÜ by mixing with a binding resin and then molding it, the maximum magnetic energy product (BH)maxÄkJ/mÜof the bonded magnet at the room temperature satisfies the relationship represented by the formula (BH)max/ rho Äx10J.m/gÜ ≥ 2.2, and the intrinsic coercive force (HCJ) of the bonded magnet at the room temperature is in the range of 320 - 720 kA/m.