磁性粒子分形聚集体的矫顽力特性

COERCIVITY PROPERTIES OF THE FRACTAL AGGREGATES FORMED BY MAGNETIC PARTICLES

用偶极场近似法导出了单畴粒子聚集体的矫顽力与其分维度的关系式,讨论了分维度对矫顽力的影响,结果表明聚集体的矫顽力随其分维度的增加而减小;通过对分维度与堆集密度之间关系的讨论,证实了所得结论与现有的理论结果和实验结果之间的一致性.

Using dipote field approximation. We derived an expression connecting fractal dimension (D) with Coercivity (He) of the single-donain particle aggregates, which shows that He is a decreasing function of D. By analyzing the relation between D and packing density P, we found that the obtained conclusion is consistent with the existing theoretical and experimental results.