铁磁薄膜中非线性静磁表面波的传播

PROPAGATION OF NONLINEAR MAGNETOSTATIC SURFACE WAVES ON FERROMAGNETIC FILM

本文用微扰理论导出了横向磁化条件下铁磁薄膜中非线性静磁表面波满足的运动方程和它的解析解。获得非线性色散关系,揭示了传播功率致使静磁表面波频带压缩。研究了群色散和非线性频移随频率和薄膜厚度的变化规律。证明了横向磁化时非线性MSSW不能以静磁孤子的形式存在。

The wave equation for nonlinear magnctostatic surface waves (MSSW) on ferromagnetic film is derived with perturbation theory under the condition of transverse magnetisation, and its solution is found. The nonlinear dispersion relation shows that a high wave power results in a reduction of frequency band of MSSW. The variations of group velocity dispersion and nonlinear frequency shift with the wave frequency and film thickness are also studied. The results show that the bright pulse envelope solitons can not exist in our case.