PERMANENT MAGNET AND DYNAMO ELECTRIC MACHINE

摘要

A high-performance permanent magnet is provided. A permanent magnet expressed by a composition formula: (R_1-xA_x)_pFe_qM_rCu_tCo_100-p-q-r-t. The magnet comprises a metal structure including a plurality of crystal grains which constitutes a main phase having a Th₂Zn₁₇ crystal phase, An Fe concentration of each of the crystal grains is 28 atomic% or more. A concentration difference of the element A among the crystal grains is not less than 0.2 atomic% nor more than 3.0 atomic%.