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首页> 外文期刊>Journal of Materials Research >The effects of grain condition on magnetic properties in Nd_4Fe_76Co_3(Hf_1-xGa_x)B_16 alloy
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The effects of grain condition on magnetic properties in Nd_4Fe_76Co_3(Hf_1-xGa_x)B_16 alloy

机译：晶粒条件对Nd_4Fe_76Co_3（Hf_1-xGa_x）B_16合金磁性能的影响

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The best linear fit of H_c(T)/M_s(T) versus 2_kl (T)/μ_oM~2_s(T) implies that H_c is determined by a nucleation process in nanocrystalline two-phase magnets. The condition of the grain shapes is improved after adding Hf and Ga, but the surfaces are deteriorated by some precipitates on the boundary. Taking into account the values of α N_eff, the results of transmission electron microscopy (TEM), and Mossbauer spectroscopy, the magnetic field heat treatment not only induces grain refinement but also causes a uniform distribution of the soft and hard phases. Both the remanence and energy product values are increased by 20-30 for all ribbons after annealing with magnetic field. The magnetic interaction in Nd_2Fe_14B/Fe_3B + α Fe-based nanocrystalline two-phase magnets is studied using δM plots in this paper. It is found that the exchange-coupled interaction is greatly enhanced in the sample annealed with magnetic heat treatment, especially Nd_4Fe_76Co_3Hf_0.5Ga_0.5Bl6, which achieves the highest energy product (BH)_max = l5.8 MGOe.
机译：H_c（T）/ M_s（T）与2_kl（T）/μ_oM〜2_s（T）的最佳线性拟合表明，H_c是由纳米晶两相磁体中的成核过程确定的。添加Hf和Ga后，晶粒形状的条件得到改善，但是由于界面上的一些沉淀而使表面劣化。考虑到αN_eff的值，透射电子显微镜（TEM）和莫斯鲍尔光谱的结果，磁场热处理不仅引起晶粒细化，而且导致软相和硬相的均匀分布。在磁场退火后，所有带的剩磁和能量乘积值都增加了20-30。本文利用δM图研究了Nd_2Fe_14B / Fe_3B +αFe基纳米晶两相磁体中的磁相互作用。发现在磁热处理后的样品中，交换耦合的相互作用大大增强，尤其是Nd_4Fe_76Co_3Hf_0.5Ga_0.5Bl6，实现了最高的能量积（BH）_max = 15．8 MGOe。

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