W, La添加Sm2Fe17N3粉末の磁気特性と微細組織

The magnetic properties and microstructure of the W and/or La added Sm-Fe-N magnetic powders were investigated. The W and La+W added Sm-Fe-N powders exhibited higher coercivity of 2.1 and 2.0 MAm-1 than that of the powder without La and W addition (1.5 MAm-1), while the La added powder had lower coercivity of 1.0 MAm-1. Initial recoil curves of each powders indicated that volume fraction of single domain particles was higher in the W and La+W added powders than in the La added powder, and the coercivity of these powders strongly depended on particles size. Microstructural observation revealed that W tended to condense in the small particle, and the W was detected from Sm2Fe17N3(0-11) plane.

This work was (in part) supported by the Elements Strategy Initiative Center for Magnetic Materials (ESICMM), Grant Number JPMXP0112101004, through the Ministry of Education, Culture, Sports, Science and Technology (MEXT).