A new type of nanocomposite magnets including elongated soft magnetic grains—computer simulation
A new type of nanocomposite magnets including elongated soft magnetic grains—computer simulation
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DOI：
10.1016/j.jmmm.2006.10.1082
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发表时间：
2007-03
影响因子：
2.7
通讯作者：
H. Fukunaga;M. Ikeda;A. Inuzuka
中科院分区：
文献类型：
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作者：
H. Fukunaga;M. Ikeda;A. Inuzuka
基于微磁学理论，模拟了由α-Fe针状相和Nd 2Fe 14 B晶粒取向相组成的纳米复合磁体的磁性能。最大能量积（BH）maxvs.α-Fe曲线上的分数有一个峰，峰对应的分数取决于α-Fe针状体的大小。对于尺寸为1.5nm的α-Fe针状体，当α-Fe含量为80vol%时，（BH）最大值约为800 kJ/m3。计算得到的（BH）最大值和相应的α-Fe含量均大于含有立方α-Fe晶粒的磁体的计算值，表明形状各向异性与交换耦合共同抑制了α-Fe针状体的磁化反转。因此，预计在所提出的纳米复合磁体中有大的（BH）max值。
Magnetic properties of nanocomposite magnets composed of α-Fe needles and aligned Nd2Fe14B grains were simulated based on the micromagnetic theory. The maximum energy product (BH)maxvs. fraction of α-Fe curve had a peak, and the fraction corresponding to the peak depended on the size of α-Fe needles. For α-Fe needles with the size of 1.5nm, the (BH)maxvalue of approximately 800kJ/m3was obtained at 80vol% α-Fe. The obtained (BH)maxvalue and the corresponding fraction of α-Fe were larger than those calculated for the magnet including cubic α-Fe grains, suggesting that the shape anisotropy suppresses the magnetization reversal in α-Fe needles in cooperation with the exchange coupling. Thus, a large (BH)maxvalue are expected in the proposed nanocomposite magnets.