Title :
Improvement in magnetic properties of Sm-Fe-N flakes by annealing under Zn vapor
Author :
Fukunaga, Hirotoshi ; Murakami, Kouichi ; Song, Jae Man ; Koh, Jae Gui
Author_Institution :
Fac. of Eng., Nagasaki Univ., Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
A new method for improving the coercivity and stability of magnetic properties of Sm-Fe-N flakes by annealing under Zn vapor is proposed. Annealing of the flakes at 380°C with Zn foil under an Ar atmosphere deposited a Zn film, resulted in formation of Fe-Zn compounds on the surface of the flakes, and improved the coercivity by 2-5 kOe. The deposition of approximately 1 wt.% Zn was enough to obtain a remarkable improvement in the coercivity. The Zn-treatment also suppressed the deterioration of the coercivity and the remanence due to exposure to air at 300°C, and an increase in the amount of Zn caused an increase in their stability. Therefore, the proposed method is expected to be a promising method for improving magnetic properties and their stability of Sm-Fe-N flakes by Zn-treatment
Keywords :
annealing; coercive force; ferromagnetic materials; iron alloys; permanent magnets; rapid solidification; remanence; samarium alloys; 300 C; 380 C; Sm-Fe-N; Sm-Fe-N flakes; Zn; annealing under Zn vapor; coercivity; magnetic properties; remanence; stability; Annealing; Argon; Atmosphere; Coatings; Coercive force; Magnetic properties; Magnets; Powders; Stability; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
