EFFECTS OF HEAT TREATMENT AND COMPOSITIONON BALL-MILLED MnBi AND MnBi/Co MAGNETS

Digest Journal of Nanomaterials and Biostructures

T. Charoensuk¹ 

关键词: Exchange coupled hard /soft magnets;    MnBi;    Ball-milling;    Annealing;    Sintering;   

DOI  :  

学科分类：生物技术

来源: Institute of Materials Physics

【 摘 要 】

The ball-milling and incorporating of cobalt (Co) are demonstrated as viable routes toproduce exchange coupled hard/soft magnets from arc-melted manganese bismuth (MnBi)ingots. Properties of MnBi/Co magnets aligned by magnetic field parallel andperpendicular to the sample’s plane are comparable but strongly influenced by the Mn:Biratio and heat treatments on the ball-milled MnBi powders. By annealing 290 C for 40 h,the powder with Mn:Bi ratio of 2:1 leads to the highest coercivity and magnetization. Inthe case of MnBi sintered at 1,000 C for 20 min, the formation of Bi2O3 nanowiresenhances the coercivity but the magnetization is reduced with the decrease in the MnBiphase.

【 授权许可】

Unknown