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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Anisotropic fully dense MnBi permanent magnet with high energy product and high coercivity at elevated temperatures
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Anisotropic fully dense MnBi permanent magnet with high energy product and high coercivity at elevated temperatures

机译：各向异性的全密度MnBi永磁体，在高温下具有高能积和高矫顽力

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摘要

The structural and magnetic properties of a fully dense anisotropic MnBi magnet prepared by hot compaction are investigated. Arc-melting and low energy ball milling are employed to synthesize highly anisotropic MnBi powders with very high remanence ratio (M_(r/M)s) of 0.97, coercivity (H_c) of 11.7 kOe and maximum energy product [(BH)_(max)] of 9 MG Oe. The bulk magnet fabricated from these powders displays anisotropic characteristics with high Mr/Ms ratio of 0.91 and a (BH)_(max) of 5.8 MG Oe at room temperature. The H_c of bulk magnet increases linearly from 6.5 kOe at 300 K to 28.3 kOe at 530 K with a (BH)_(max) of 3.6 MG Oe at 530 K. Analysis of the temperature dependence of Hc suggests the nucleation of reversed domains as the dominant mechanism for the magnetization reversal.
机译：研究了通过热压制备的全致密各向异性MnBi磁体的结构和磁性。电弧熔化和低能球磨用于合成高各向异性MnBi粉末，其剩磁比（M_（r / M）s）为0.97，矫顽力（H_c）为11.7 kOe，最大能量乘积[（BH）_（最多）的9 MG Oe。由这些粉末制成的块状磁体在室温下具有0.91的高Mr / Ms比和5.8 MG Oe的​​（BH）_（max）的各向异性特征。大块磁体的H_c从300 K的6.5 kOe线性增加到530 K的28.3 kOe，在530 K时的（BH）_（max）为3.6 MG Oe线性增加。对Hc的温度依赖性的分析表明，反向畴的成核为磁化反转的主要机制。

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