Patent ID: 6951625

Claim:
An isotropic bonded magnet formed by binding a magnetic powder containing Al with a binding resin, wherein the isotropic bonded magnet is characterized in that: the magnetic powder is composed of an alloy composition resented by R x (Fe 1-x Co y ) 100-x-z-w B z Al w (where R is at least one rare-earth element, x is 7.1-9.9 at %, v is 0-0.30, z is 4.6-6.9 at %, and w is 0.02-1.5 at %), when the density of the isotropic bonded magnet is defined as ρ[Mg/m 3 ], the remanent magnetic flux density Br[T] at room temperature satisfies the relationship represented by the formula of Br/ρ[×10 −6 T·m 3 /g]>0.125; the irreversible susceptibility (χ irr ) of the isotropic bonded magnet which is measured by using an intersectioning point of a demagnetization curve in the J-H diagram representing 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 −3.8×10 −6 H/m as a starting point is less than 5.0×10 −7 H/m; and the intrinsic coercive force (H CJ ) of the isotropic bonded magnet at the room temperature is in the range of 320-720 kA/m.