Spin waves (SWs) in coupled Co/FeNi bilayers are probed by the Brillouin light‐scattering technique. Two types of SWs, magnetostatic surface spin waves (MSSWs) and perpendicular standing SWs, are identified. The dispersion relations of MSSWs obtained from the Stokes and anti‐Stokes measurements display, respectively, positive and negative group velocities. The anti‐Stokes branch with positive phase velocities and negative group velocities is called the backward magnetostatic surface mode that originates from the magnetostatic interaction in the bilayer. Experimental data agree well with our theoretical calculations. Our results are used to understand SWs propagation.

中文翻译：

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Co / FeNi双层中的反向静磁表面自旋波

布里渊光散射技术探测了耦合的Co / FeNi双层中的自旋波（SW）。确定了两种类型的开关，静磁表面自旋波（MSSW）和垂直站立的开关。从Stokes和反Stokes测量获得的MSSW的色散关系分别显示正速度和负速度。具有正相速度和负基团速度的反斯托克斯分支称为反向静磁表面模式，其起源于双层中的静磁相互作用。实验数据与我们的理论计算非常吻合。我们的结果用于了解软件的传播。