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

机译:热处理和成分对球磨MnBi和MnBi / Co磁体的影响

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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.
机译:球磨和钴(Co)的掺入被证明是可行的方法,可以从电弧熔化的锰铋(MnBi)锭生产交换耦合的硬/软磁铁。平行于且垂直于样品平面的磁场对准的MnBi / Co磁体的性能可比,但是受球磨MnBi粉末中Mn:倍率和热处理的强烈影响。通过在290°C下退火40小时,Mn:Bi比为2:1的粉末可获得最高的矫顽力和磁化强度。在MnBi在1,000°C下烧结20分钟的情况下,Bi2O3纳米线的形成增强了矫顽力,但是磁化强度随MnBi相的减少而降低。

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