| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnet having excellent magnetic characteristics and high reliability, in particular, a magnet having an excellent thermal stability. SOLUTION: A magnet power consists of an alloy composition expressed by Rx(Fe1-yCoy)100-x-z-wBzNbw (wherein R represents at least one kind of rare earth element, x: 7.1 to 9 at.%, y: 0 to 0.30, z: 4.6 to 6.9 at.%, and w: 0.2 to 3.5 at.%), and constituted with a complex composition having a soft magnetic phase and a hard magnetic phase. When the power is mixed with a bonding resin and molded to obtain an isotropic bond magnet, the irreversible magnetic susceptibility (χirr=χdif-χrev is not more than 5.0×10-7 henry/m and the intrinsic coercive force HcJ at room temperature is 320 to 730 kA/m in case a measurement is made at a point P, as a starting point, in a demagnetization curve in Fig. J-H showing magnetic characteristics at room temperature, which intersects with a straight line y that passes through the origin in the Fig. J-H and has an inclination (J/H) of -3.8×10-6 henry/m. |
