Mn-Bi Magnetic Powders With High Coercivity and Magnetization at Room Temperature

Author

Chinnasamy, Chins ; Jasinski, Melania M. ; Ulmer, Aaron ; Li, Wanfeng ; Hadjipanayis, George ; Liu, Jinfang

Author_Institution

Electron Energy Corp., Landisville, PA, USA

Volume

48

Issue

11

fYear

2012

Firstpage

3641

Lastpage

3643

Abstract

Mn₅₅Bi₄₅+x at.% Mn ( x=0, 7 and 11) magnetic powders were prepared by low energy ball milling technique. The x-ray diffraction pattern showed that the samples mainly contain over 90% of the low temperature Mn-Bi phase for x = 0 and 7 with a very small amount of Bi phase. Microstructural analysis showed that the amount of sub-micron particles increases with milling time. The milling time dependent magnetic properties were studied for all the compositions. An intrinsic coercivity (H_ci) of 12.2 kOe, remanent magnetization (4 πM_r) of 7.1 kG, and energy product (BH)_max of 11 MGOe have been obtained for the 8 hours milled Mn₅₅Bi₄₅+7 at.% Mn sample. These Mn-Bi powders have potential use as precursor for rare earth free permanent magnets.

Keywords

X-ray diffraction; ball milling; bismuth alloys; coercive force; crystal microstructure; magnetic particles; manganese alloys; remanence; Mn₅₅Bi₄₅; X-ray diffraction; high coercivity; intrinsic coercivity; low energy ball milling; low temperature effect; magnetic powders; magnetic properties; magnetization; microstructural properties; remanent magnetization; temperature 293 K to 298 K; time 8 h; Bismuth; Coercive force; Manganese; Milling; Perpendicular magnetic anisotropy; Powders; High coercivity Mn-Bi; MnBi powders; low energy ball milling; low temperature phase Mn-Bi; rare earth free permanent magnet;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2012.2201146

Filename

6332664