双层磁性膜自旋波能量耗散的研究

Study on the Energy Dissipation of the Bilayer Magnetic Thin Film Spinning Wave

建立了外场作用下双层膜的自旋波共振模型,求出双层磁性膜的有效阻尼参数,得到能量耗散特征量——自旋波谱线宽度2△H随波矢k1、双层膜厚度、阻尼参量和回转磁化率等的变化关系．对YsmFe5O12／(LaEr)3(FeGa)5O12 双层膜进行计算,其理论计算与实验结果一致．结果表明:在阻尼系数有较大差异的两层膜中,自旋波线宽度2△H 随激发层中自旋波矢增大而明显增大．

With the field-generated bilayer film spin wave sympathetic vibration, the authors figured out the effective damPing parameter of the bilayer magnetic film, and the amount of characteristics of the energy dissipation 2△H, the breadth of spin wave spectrum line changes with κ1, wave vector, with the thickness of the bilayer film and the damping parameter and the rotating susceptibility. The theoretical result of the YSmFe5O12/（LaEr）3 （FeGa）5 O12 bilayer film is consistent with the one comes from it＇s experiment. As a result, in the bilayer films With large differences, 2△H, the breadth of spin wave spectrum line is en- larged with the spin wave Vector in the excitation layer.