Magnetization configurations of a tri-layer nanopillar ferromagnet/nonmagnetic spacer/ferromagnet
Magnetization configurations of a tri-layer nanopillar ferromagnet/nonmagnetic spacer/ferromagnet
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DOI：
10.1063/1.4706560
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发表时间：
2012-05
影响因子：
3.2
通讯作者：
O. Sukhostavets;G. R. Aranda;K. Guslienko
中科院分区：
文献类型：
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作者：
O. Sukhostavets;G. R. Aranda;K. Guslienko
采用微磁方法计算了三层圆形纳米柱的平衡磁化构型。假设纳米柱是铁磁/非磁/铁磁层的垂直堆叠。通过微磁模拟对纳米柱的几何参数（半径和厚度）区域进行了分析计算和检查，其中磁涡旋和单畴态出现在基态中。层间静磁耦合本质上影响两个铁磁层中涡流或单畴态的形成。发现铁磁层和间隔物的厚度对涡旋态的稳定性有相当大的影响。结果可用于解释纳米柱和隧道结中自旋扭矩引起的磁化动力学的实验，并可用于估计纳米柱的基态。
The equilibrium magnetization configurations of tri-layer circular nanopillar are calculated within micromagnetic approach. Nanopillar is assumed to be a vertical stack of ferromagnetic/nonmagnetic/ferromagnetic layers. The regions of geometrical parameters of nanopillar (radius and thickness), where the magnetic vortices and single domain states appear in the ground state, are calculated analytically and checked by micromagnetic simulations. The interlayer magnetostatic coupling affects essentially the formation of vortices or single domain states in both ferromagnetic layers. A considerable influence of the thicknesses of the ferromagnetic layers and spacer on the stability of vortex states is found. The results can be applied to interpret experiments on spin torque induced magnetization dynamics in nanopillars and tunnel junctions and also to estimate the nanopillar ground states.