| 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 powder consists of an alloy composition expressed by Rx(Fe1-yCoy)100-x-z-wBzAlw (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: 0.02 to 1.5 at.%), and constituted with a complex composition having a soft magnetic phase and a hard magnetic phase. When the powder is mixed with a bonding resin and molded to obtain an isotropic bond magnet, the irreversible magnetic susceptibility (ωirr=ωdif-ω rev) is not more than 5.0×10-7 henry/m and the intrinsic coercive force HcJ at room temperature is 320 to 720 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. |
