[S5] Element strategy for high performance permanent magnets 7 - Fundamental and basic research toward next-generation novel materials -(2)

[S5.22] Analysis of coercivity mechanism in rapid-quenched magnet powders of ThMn₁₂ type structure

*Kobayashi Kurima¹, Kuno Tomoko^1,2, Yamamoto Takahide¹, Endoh Koh-hei¹ (1. Shizuoka Institute of Science and Technology, 2. Tohoku University)

Keywords:ThMn₁₂型構造磁石、保磁力、STEP法、MFM、磁区構造

Sm系ThMn₁₂型構造磁石超急冷粉体を、低酸素分圧（PO2<10^-2Pa）中1223K/30分間熱処理後、Step法で解析すると、より低温で熱処理した試料の約倍量の多磁区粒子の存在が認められた。