DEPENDENCE OF MAGNETIC PROPERTIES ON GRAIN SIZE OF ALPHA -FE IN NANOCOMPOSITE (ND, DY)(FE, CO, NB, B)5.5/ALPHA -FE MAGNETS

DEPENDENCE OF MAGNETIC PROPERTIES ON GRAIN SIZE OF ALPHA -FE IN NANOCOMPOSITE (ND, DY)(FE, CO, NB, B)5.5/ALPHA -FE MAGNETS
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DOI：
10.1063/1.123673
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发表时间：
1999-03
期刊：
Applied Physics Letters
影响因子：
4
通讯作者：
Xiaokai Sun;Jian Zhang;Yelong Chu;W. Liu;B. Cui;Zhidong Zhang
Xiaokai Sun;Jian Zhang;Yelong Chu;W. Liu;B. Cui;Zhidong Zhang
中科院分区：
物理与天体物理2区
文献类型：
--
作者：
Xiaokai Sun;Jian Zhang;Yelong Chu;W. Liu;B. Cui;Zhidong Zhang

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对于（Nd0.9Dy0.1）（Fe0.77Co0.12Nb0.03B0.08）5.5/α-Fe纳米复合磁体，当α-Fe平均晶粒尺寸d=15 nm，α-Fe含量cm= 45wt%（远低于软磁相的结构逾渗阈值）时，磁性能最佳。α-Fe晶粒尺寸与磁化率的关系表明，当cm> 30wt%时，最佳晶粒尺寸dop随α-Fe含量的增加而增加。如果d>dop，则形成收缩的磁滞;如果d<dop/2，则由于位于软晶粒两侧的硬磁晶粒之间可能的耦合，磁性迅速降低。
For the nanocomposite magnets (Nd0.9Dy0.1)(Fe0.77Co0.12Nb0.03B0.08)5.5/α-Fe, the best magnetic properties were obtained with the average grain size of α-Fe d=15 nm and with the content of α-Fe cm=45 wt % that is well below the structural percolation threshold of the soft magnetic phase. The measured dependence of the coercivity on the grain size of α-Fe tends to indicate that the optimum grain size dop increases with increasing α-Fe content, for cm>30 wt %. If d>dop, contracted hysteresis is formed; if d<dop/2, the coercivity rapidly decrease due to possible coupling between hard magnetic grains situated at two sides of a soft grain.