Title :
Coercivity of Sm2Fe17N3 particles prepared by mechanically grinding without exposing in air
Author :
Sasaki, I. ; Fujii, H. ; Okada, H. ; Suzuki, S.
Author_Institution :
Fac. of Integrated Arts & Sci., Hiroshima Univ., Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
As a first step for clarifying coercivity mechanism in high-performance permanent magnets, the effect of particle size on coercivity in Sm2Fe17N3 was studied by mechanically grinding method without exposing in air. The coercivity increases with increasing the grinding time, reaches a maximum value of 1.23 T at grinding time for 60 min and gradually decreases beyond 90 min grinding, The resultant maximum energy product reaches up to 329 kJ/m 3 for 60 min grinding. However, the coercivity of 1.23 T is still too small compared with the anisotropy field, suggesting that the surface effect controls the coercive force in this system, rather than the size effect
Keywords :
coercive force; ferromagnetic materials; grinding; iron alloys; magnetic anisotropy; magnetic particles; mechanical alloying; particle size; permanent magnets; samarium alloys; 1.23 T; 60 to 90 min; Sm2Fe17N3; Sm2Fe17N3 particles; anisotropy field; coercivity; grinding time; high-performance permanent magnet; maximum energy product; mechanically grinding; particle size; surface effect; Anisotropic magnetoresistance; Ball milling; Coercive force; Demagnetization; Force control; Iron; Permanent magnets; Samarium; Saturation magnetization; Size control;
Journal_Title :
Magnetics, IEEE Transactions on
