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用铁磁共振方法得到了双层铁磁薄膜的色散关系解析表达式.发现共振场依赖于层间耦合强度和应力场.假定层间为反铁磁性耦合,且铁磁层A有较强的平面内各向异性.随着外磁场的增强,铁磁层B中的磁化强度突然由最初的反平行转为平行,从而导致色散曲线的阶跃,并且发现光学模阶跃幅度比声学模大.随着应力场的增强,B层中磁化强度反转所需的外磁场减弱.此外,在不同的交换耦合强度和应力场下,光学模共振场对外磁场方向的依赖性较强.
The ferro-magnetic resonance method was used to obtain the analytic expression for the dispersion relation of the two-layer ferromagnetic films. The resonant field was found to depend on the inter-layer coupling strength and stress field. Assuming the layers were antiferromagnetic coupling and the ferromagnetic layer A had a strong Plane anisotropy.With the increase of the external magnetic field, the magnetization in the ferromagnetic layer B suddenly turns from the original antiparallel to parallel, resulting in the step of the dispersion curve, and the optical mode step amplitude is found to be larger than the acoustic mode As the stress field increases, the external magnetic field required for the reversal of the magnetization in layer B weakens, and the dependence of the optical mode resonance on the direction of the external magnetic field is stronger under different exchange coupling strength and stress fields.