New NdFeB-based bulk "exchange spring"-type permanent magnets. Experimental and micromagnetic FORC analysis

INTERMAG 2006 - IEEE International Magnetics Conference Pub Date : 2006-05-08 DOI:10.1109/INTMAG.2006.375803

H. Chiriac, N. Lupu, L. Stoleriu, P. Postolache, A. Stancu

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Abstract

Summary form only given. This paper focuses on the possibility of direct casting miniature NdFeB-based bulk permanent magnets in different three-dimensional shapes for various applications, with amorphous structure followed by subsequent optimal annealing. Nd₃Dy₁Fe₆₆Co₁₀B₂₀ bulk nanocomposite permanent magnets in form of rods with diameters ranging from 0.5 to 0.8 mm have been prepared by devitrification annealing of amorphous and partly-amorphous precursors produced by injection die-casting. A fully amorphous structure was obtained for rods with the diameter as large as 0.6 mm. The best-achieved magnetic properties have been obtained for the optimum devitrification (15 min at 630degC) samples with 0.6 mm diameter, and are: H_C,5T = 316 kA/m, mu₀M_r,6T= 1.04 T, M_r/M_max,6T=0.68 and (BH)_max,6T=98 kJ/m³. The samples were characterized using the first-order reversal curve diagram (FORC). The micromagnetic simulation reproduced the experimental results.

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新型钕铁硼基块状“交换弹簧”型永磁体。实验和微磁FORC分析

只提供摘要形式。本文重点研究了直接铸造不同三维形状的微型钕铁硼块体永磁体的可能性，这些永磁体具有非晶结构，然后进行优化退火。采用非晶和部分非晶前驱体注射压铸制备了直径为0.5 ~ 0.8 mm棒状的Nd3Dy1Fe66Co10B20块状纳米复合永磁体。直径为0.6 mm的棒材获得了完全非晶结构。对直径为0.6 mm的样品进行最佳脱玻化反应(630℃下15 min)，得到了最佳的磁性能:HC,5T = 316 kA/m, mu0Mr,6T= 1.04 T, Mr/Mmax,6T=0.68， (BH)max,6T=98 kJ/m3。采用一阶反转曲线图(FORC)对样品进行表征。微磁模拟再现了实验结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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INTERMAG 2006 - IEEE International Magnetics Conference

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