Patent ID: 6558482
Filing Date: 2003-05-06
Classification: B82Y,H01F

Abstract:
A magnetic powder comprising:an alloy composition represented by Rx(Fe1âˆ’yCoy)100-x-z-wBzAlw (where R is at least one rare-earth element, x is 8.1-9.4 at %, and y is 0.0-0.30, z is 4.6-6.8 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; the soft magnetic phase and the hard magnetic phase have a mean crystal grain size of 1-100 nm; wherein the magnetic powder has characteristics in which, when an isotropic bonded magnet is molded by mixing the magnet powder with a binding resin, the irreversible susceptibility (Xirr) which is measured by using an intersectioning point of a demagnetization curve in the J-H diagram representing the magnetic characteristics at room temperature and a straight line which passes the origin in the J-H diagram and has a gradient (J/H) of âˆ’3.8âˆ’10âˆ’6 H/m as a starting point is less than 5.0Ã—10âˆ’7 H/m, and the intrinsic coercive force (Hcj) of the magnet at room temperature is in the range of 406-717 kA/m.