| 摘要 |
In one embodiment, a permanent magnet includes a sintered compact having a composition expressed by a composition formula: Rp1Feq1Mr1Cus1Co100-p1-q1-r1-s1 (R is a rare-earth element, M is at least one element selected from Zr, Ti, and Hf, 10≰p1≰13.3 at %, 25≰q1≰40.0 at %, 0.88≰r1≰5.4 at %, and 3.5≰s1≰13.5 at %). The sintered compact includes crystal grains each composed of a main phase including a Th2Zn17 crystal phase, and a Cu-rich phase having a composition with a high Cu concentration and an average thickness of 0.05μm or more and 2μm or less. |
