CoFeB/Ta/NiFe曲折型磁性双层膜的磁振子能带结构
Magnonic band structure in CoFeB/Ta/NiFe meander-shaped magnetic bilayers
摘要：
在这项工作中，我们研究了自旋波在三维纳米CoFeB/Ta/NiFe曲折结构的结构SiO2/Si衬底上制作的传播。用波矢分辨布里渊光散射（BLS）技术测定了磁振子的能带结构，并确定了一组由两个Bloch型色散模插入的定态模。结果可以理解的微磁和有限元模拟的模式分布在实空间和频域。的频散模式周期性地振荡的布里渊区的频率和对应的模式，其空间分布延伸到整个样品，或者是本地化专门在CoFeB层或整个CoFeB/Ta/NiFe磁性双层。稳态模主要集中在CoFeB和NiFe层的垂直段，水平段的振幅可以忽略不计。与具有相同几何参数的单层CoFeB弯曲结构的结果进行了比较，揭示了两层铁磁层间的偶极耦合对磁振子能带结构的影响.
英文摘要：
In this work, we investigate the spin-wave propagation in three-dimensional nanoscale CoFeB/Ta/NiFe meander structures fabricated on a structured SiO2/Si substrate. The magnonic band structure has been experimentally determined by wavevector-resolved Brillouin light scattering (BLS) spectroscopy and a set of stationary modes interposed by two dispersive modes of Bloch type have been identified. The results could be understood by micromagnetic and finite element simulations of the mode distributions in both real space and the frequency domain. The dispersive modes periodically oscillate in frequency over the Brillouin zones and correspond to modes, whose spatial distributions extend over the entire sample and are either localized exclusively in the CoFeB layer or the entire CoFeB/Ta/NiFe magnetic bilayer. Stationary modes are mainly concentrated in the vertical segments of the CoFeB and NiFe layers and show negligible amplitudes in the horizon-tal segments. The findings are compared with those of single-layer CoFeB meander structures with the same geometry parameters, which reveals the influence of the dipolar coupling between the two ferromagnetic layers on the magnonic band structure.
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