リコイルカーブを用いたNd-Fe-B系HDDR磁粉の磁化過程解析(ハード・ソフト磁性材料)

概要

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The magnetization mechanism of an Nd-Fe-B HDDR magnet was studied by measuring its recoil curves. When compared with those of isotropic Nd-Fe-B sintered, HDDR, and melt-spun magnets, the behavior of the recoil curves of the HDDR magnet was similar to that of the recoil curves of the melt-spun magnet. This means that the isotropic HDDR magnet behaved like single-domain particles. In addition, calculated isotropic recoil curve that assumes only rotation of the magnetization of single-domain particles showed the same tendency as the recoil curves of the HDDR magnet. This result indicates that the recoil curves of an isotropic HDDR magnet were dominated by rotation of the magnetization, and were not significantly influenced by domain wall movement. Moreover, the recoil curve of an anisotropic HDDR magnet behaved similarly to calculated anisotropic recoil curve based on the rotation of the magnetization of single-domain particles with an orientation distribution. This means that the recoil curves of an anisotropic HDDR magnet were also dominated by rotation of the magnetization. These results suggest that the HDDR magnet behaved like single-domain particles in its recoil curves, which were dominated by rotation of the magnetization and were not significantly influenced by domain wall movement.
社団法人日本磁気学会の論文
2007-05-01