Patent ID: 6852246

Claim:
An isotropic rare-earth bonded magnet comprising: a magnetic powder having a composition consisting of R x (Fe 1-y Co y ) 100-x-z-w B z Si w (where R is at least one rare-earth element, x is 8.1-9.4 at %, y is 0-0.30, z is 4.6-6.8 at %, and w is 0.2-3.0 at %), the magnetic powder having a composite structure including a soft magnetic phase and a hard magnetic phase; and a binding resin, wherein the isotropic rare-earth bonded magnet is characterized in that an irreversible susceptibility (χ irr ) is equal to or less than 5.0×10 −7 H/m; the irreversible susceptibility is measured by using a point where a demagnetization curve in a J-H diagram and a straight line that passes through the origin in the J-H diagram intersect; the demagnetization curve represents the magnetic characteristics at room temperature, and the straight line has a gradient (J/H) of −3.8×10 −6 ; and the intrinsic coercive force (H CJ ) of the magnet at the room temperature is in the range of 406-717 kA/m.