晶粒尺寸分布对纳米永磁材料矫顽力的影响

Effect of grain size distribution on coercivity in nanometer materials

采用对数高斯分布模型,研究了晶粒尺寸分布对纳米硬磁材料有效各向异性Keff和矫顽力Hc的影响.研究结果表明:Keff和Hc随晶粒尺寸分布的集中而增加.纳米硬磁材料矫顽力的下降主要是由有效各向异性的下降引起的.为获得较高的矫顽力,晶粒尺寸分布应尽可能的集中.

The effect of grain size distribution on effective anisotropy Keff and coercivity Ho has been investigated by adopting logarithm Gussian distribution. The results showed that Koff and Hc increased with the grain size distribution becoming central. The decrease of coercivity is mainly determined by the reduction of effective anisotropy. As a result, the grain size distribution should be as central as possible.