Improvement in magnetic properties of Sm-Fe-N flakes by annealing under Zn vapor

• Published in: IEEE transactions on magnetics Vol. 35; no. 5; pp. 3298 - 3300
• Main Authors: Fukunaga, H., Murakami, K., Jae Man Song, Jae Gui Koh
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01-09-1999; Institute of Electrical and Electronics Engineers
• Subjects: ANNEALING; Applied sciences; ARGON; Atmosphere; Coatings; COERCIVE FORCE; Coercivity; Condensed matter: electronic structure, electrical, magnetic, and optical properties; CONTROLLED ATMOSPHERES; Deposition; Exact sciences and technology; Fe and its alloys; Flakes; IRON ALLOYS; MAGNETIC PROPERTIES; Magnetic properties and materials; Magnets; MATERIALS SCIENCE; Metals. Metallurgy; NITROGEN ADDITIONS; Physics; Powders; SAMARIUM ALLOYS; Stability; Studies of specific magnetic materials; ZINC; Samarium alloys; Annealing; Stability; Ternary alloys; Magnetic hysteresis; XRD; Experimental study; Heat treatments; Boron alloys; Quenching; Hysteresis loop; Remanent magnetization; Coercive force; Iron base alloys; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.800504

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/spl deg/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/spl deg/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.