Coercivity of a percolative magnetic system
Coercivity of a percolative magnetic system
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DOI：
10.1103/physrevb.63.060401
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发表时间：
2000-12
影响因子：
3.7
通讯作者：
J. Mejía‐López;R. Ramírez;M. Kiwi;M. Pechan;J. Z. Hilt;S. Kim;H. Suhl;I. Schuller
中科院分区：
文献类型：
--
作者：
J. Mejía‐López;R. Ramírez;M. Kiwi;M. Pechan;J. Z. Hilt;S. Kim;H. Suhl;I. Schuller
提出了一个描述聚结Ni膜的渗透率Hc行为的模型。我们发现，有一个非单调的依赖性，矫顽场的占有概率p的函数。这种行为是集群的大小和拓扑结构的函数，是独立的薄膜的生长方向。基于这些想法，我们从理论上预测，并证实实验，作为外部磁场方向的函数的Hc的依赖性。对于@111 #取向的面心立方薄膜，当p小于逾渗阈值pcr时，观察到六重对称性。然而，如果p' PCR，则渗流是各向同性的。
A model that describes the behavior of the coercivity Hc , of coalescing Ni films, as a percolation phenomenon is presented. We show that there is a nonmonotonic dependence, of the coercive field as a function of the occupation probability p. This behavior is a function of cluster size and topology, and is independent of the growth direction of the thin film. Based on these ideas we predict theoretically, and confirm experimentally, the dependence of Hc as a function of external magnetic field orientation. For a @111# oriented fcc film, if p is less than the percolation threshold pcr , a sixfold symmetry is observed. However, if p’ pcr the percolation is isotropic.