abstract |
This invention describes a permanent magnet comprising a composition represented by the formula R p Fe q M r Cu s Co 100-pqrs , (R is a rare earth element, M is at least one element selected from Zr, Ti and Hf, 10 ≤ p ≦ 13.5 at%, 28 ≦ q ≦ 40 at%, 0.88 ≦ r ≦ 7.2 at% and 3.5 ≦ s ≦ 13.5 at%), and a metallic structure comprising a cell phase having a Th 2 Zn 17 crystal phase, and a cell wall phase. The Fe concentration (C1) in the cell phase is in the range of 28 to 45 atom% and the difference (C1-C2) between the Fe concentration (C1) in the cell phase and the Fe concentration (C2) in the cell wall phase greater than 10 at%. |