Origin of fourfold anisotropy in square lattices of circular ferromagnetic dots
Origin of fourfold anisotropy in square lattices of circular ferromagnetic dots
复制标题
DOI：
10.1103/physrevb.74.060406
复制
发表时间：
2006-08-01
影响因子：
3.7
通讯作者：
Novosad, V.
中科院分区：
文献类型：
--
作者：
Kakazei, G. N.;Pogorelov, Yu. G.;Novosad, V.
我们讨论了四重各向异性的面内铁磁共振场H-r，发现在一个正方形晶格的圆形坡莫合金点时，点间距离a变得可比的点直径d。沿晶格轴的最小H-r< 11 >沿着和沿轴的最大< 10 >H-r沿着相差类似于50 Oe（a/d=1.1）。这种各向异性，在均匀磁化的点中是不期望的，通过在足够强的施加场下响应于图案化磁结构中的偶极力的点中的非均匀磁化m（r）的机制来解释。它是很好地描述了一个连续变分过程的迭代解。
We discuss the fourfold anisotropy of the in-plane ferromagnetic resonance field H-r, found in a square lattice of circular Permalloy dots when the interdot distance a becomes comparable to the dot diameter d. The minimum H-r along the lattice < 11 > axes and the maximum along the < 10 > axes differ by similar to 50 Oe at a/d=1.1. This anisotropy, not expected in uniformly magnetized dots, is explained by a mechanism of nonuniform magnetization m(r) in a dot in response to dipolar forces in the patterned magnetic structure under strong enough applied field. It is well described by an iterative solution of a continuous variational procedure.