诱导磁场对Bi-Mn合金微观结构与磁性的影响

用x射线衍射和低温磁测量方法，系统研究了在外加诱导磁场下制备的Bi Mn合金的微观结构和磁性.结果表明，在外加诱导磁场下制备的Bi Mn wt6%合金呈现典型的双相结构和各向异性特征，MnBi相c轴沿外加诱导磁场方向取向排列.随外加诱导磁场的增大，剩余磁化强度Mr逐渐增大，这说明MnBi相的取向程度越来越好.发现MnBi相的自旋重取向温度TSR随外加诱导磁场的增大逐渐向高温区移动.对外加诱导磁场影响Bi Mn wt6%合金的微观结构和磁性以及该类材料磁各向异性能的物理机理进行了分析和讨论. 关键词： 磁场诱导 Bi Mn合金 MnBi相 定向排列

Effect of induced magnetic field on microstructure and magnetic properties of Bi-Mn alloy

The Bi_Mn wt6% alloys were solidified from semi_solid state in a magnetic field. The microstructure and magnetic properties have been studied systematically. The results show that the samples were of a eutectic structure of double phases and have large anisotropy. It was shown that the alignment of MnBi crystals occurred along the induced field. With increasing induced magnetic field, the remanence(Mr) increased gradually, which shows that the higher the induced magnetic field, the better the alignment. The spin reorientation temperature (TSR) for MnBi alloys increases with increasing induced magnetic field. The effects of the induced field on the microstructure and the magnetic properties of Bi_Mn wt6% alloys were also discussed.