垂直取向硬/软磁性多层膜反磁化成核场的微磁学模拟  

Micromagnetism simulation of nucleation field for perpendicularly orientated composite magnetic material

作　　者：薄鸟 孟凡木 

机构地区：[1]中国武装警察部队武警警官学院数学与物理学系,四川成都610213

出　　处：《磁性材料及器件》2014年第3期17-20,共4页Journal of Magnetic Materials and Devices

摘　　要：以垂直取向硬/软磁性多层膜系统为对象,考虑形状各向异性能,利用微磁学方法分析得到一致转动与非一致转动模型反磁化成核场的解析公式。比较不同情况下两种模型的成核场随磁层厚度的变化。对两个模型,成核场都随软磁层厚度Ls增大而降低、硬磁层厚度Lh增大而增高。硬磁层厚度对一致转动模型成核场Co NH始终有着显著的影响;但对非一致转动模型,只有当小于其磁畴壁厚度时,成核场in NH才出现明显的变化。比较两种模型下的成核场,发现非一致转动成核场总是小于一致转动成核场。由此可知,复合磁性多层膜的成核模型以非一致转动为主。Analytical formulas for nucleation fields have been derived for both coherent and incoherent rotation models in a hard/soft multilayer system with anisotropy perpendicular to the film plane, taking into account the shape anisotropy energy. Comparison of nucleation fields versus layer thicknesses was given for two models under different conditions. For both coherent and incoherent rotation models nucleation field decreases as the soft layer thickness Ls increases, whereas increases with increasing the hard layer thickness Lb. However, Lh has obvious influence on the incoherent rotation nucleation field HN in only when Lh is smaller than its domain wall width, while it always has Co apparent effect on the coherent rotation nucleation field HN Co. Comparison of nucleation fields for different models shows that the incoherent rotation nucleation field is always smaller than the coherent one, suggesting that the dominant nucleation model in the composite materials is mainly the incoherent one.

关 键 词：硬/软磁性多层膜 微磁学 成核场 一致转动 非一致转动 

分 类 号：O484.43[理学—固体物理]