异质双层磁性薄膜中自旋波的波形演化

在一维海森堡模型的基础上，采用界面参数化方法，将双层异质磁薄膜中自旋波本征值问题归结为联立求解能量约束方程和界面参数化方程．重点讨论体系中体模和完全禁闭模的波形演化过程，发现体系中体模波形随自旋波矢呈余弦变化，会出现局域共振现象．激发能对两子层中体模有较大的影响，不仅影响体模的振幅，而且还影响体模的波长．另外，激发能对体系中的完全禁闭模也有较大影响，随着激发能增大，铁磁层中完全禁闭模波长变短，波速变小，但振幅不变．

The waveforms evolvement of spin waves in heterogeneity magnetic bilayer films

Based on the one-dimension Heisenberg model, the eigenproblems of spin waves in a heterogeneity magnetic bilayers system are solved using the interface-rescaling approach. The waveforms evolvement process of bulk modes and perfect-confined modes are discussed. The waveforms of bulk modes present cosine with spin wave vector. The local resonance phenomena are observed. The influence of excitation energy on bulk mode and perfect-confined mode of two sublayers is obvious. The wavelength and the amplitude of bulk mode are varied with excitation energy. With the increase at excitation energy, the wavelength of perfect-confined mode in ferromagnetic layer is shortened, the velocity is diminished and the amplitude is fixed.