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

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3298

Lastpage

3300

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800504

Filename

800504