交换耦合Co/FeNi双层膜中的后向静磁表面自旋波
Backward magnetostatic surface spin waves in exchange coupled Co/FeNi bilayers
摘要：
利用布里渊光散射（BLS）技术研究了后向静磁表面自旋波（SW）在Co/FeNi交换耦合双层膜中的传播。两种类型的SW模式被确定在我们的BLS测量。它们是静磁表面波（MSSW）模式和垂直自旋驻波（PSSW）模式。由Stokes和Anti-Stokes测量得到的MSSW的色散关系分别为正群速度和负群速度。具有正相速度和负群速度的反斯托克斯分支，称为后向静磁表面模，起源于双层膜的静磁相互作用。实验数据与理论计算符合得很好。我们的研究结果有助于理解SW传播和SW存储设备的性能。
英文摘要：
Propagation of backward magnetostatic surface spin waves (SWs) in exchange coupled Co/FeNi bilayers are studied by using Brillouin light scattering (BLS) technique. Two types of SWs modes were identified in our BLS measurements. They are magnetostatic surface waves (MSSWs) mode and perpendicular standing spin waves (PSSWs) mode. 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, known as backward magnetostatic surface mode originates from the magnetostatic interaction of the bilayer. The experimental data are in good agreement with the theoretical calculations. Our results are useful for understanding the SWs propagation and miniaturizing SWs storage devices.
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