| 简介 |
A permanent magnet of the embodiment includes : a composition represented by a composition formula : R(Fe p M q Cu r C t Co l-p-q-r-t ) z (R is at least one element selected from rare-earth elements, M is at least one element selected from Ti, Zr and Hf, 0.01 ‰¤ p ‰¤ 0.01 ‰¤ q ‰¤ 0.01 ‰¤ r ‰¤ 0.1, 0.002 ‰¤ t ‰¤ 0.03, and 6 ‰¤ z ‰¤ 9); and a metallic structure including a main phase containing a Th 2 Zn 17 crystal phase, and a sub phase of the element M having an element M concentration of 30 atomic% or more. The sub phase of the element M precipitates in the metallic structure. A ratio of a circumferential length to a precipitated area of the sub phase of the element M is 1 or more and 10 or less. |
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