Abstract
The excellent anisotropic Mn55Bi45 powder was prepared by arc melting and surfactant-assisted low-energy ball milling (LEBM). The microstructure and magnetic properties of the alloy were investigated. The ionic polyvinylpyrrolidone (PVP) was selected as a surfactant. The results show that the addition of PVP can improve the low-temperature phase (LTP) content and magnetic properties of the Mn55Bi45 alloy. The coercivity (Hcj) of the anisotropic Mn55Bi45 powder is 14.7 kOe, the maximum energy product ((BH)max) is 7.1 MGOe and the saturation magnetization (Ms) is 57.5 emu/g when it is 10 wt% PVP and after 3 h ball milling. The angle dependence of coercivity shows that mechanism of anisotropic Mn-Bi alloy follows to the Stoner-Wohlfarth model.
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