平面约束下金属铁磁条中平行抽运微波磁场的非稳定阈值研究

运用Landau-Lifshitz方程，边界处动态磁化强度由有效偶极边界条件约束，研究了无限长金属磁条中自旋波传播的特征，得到了该体系抽运微波磁场的阈值曲线以及色散曲线的解析式，揭示出自旋波激发谱与磁条宽度的具体关系.结果表明，平面约束下磁条的阈值曲线中出现了明显的扭结现象.并且随着磁条宽度的增加，其扭结数近似地呈指数形式增加，而最低扭结处两阈值的跳跃差值几乎呈反比形式变化.关键词：Landau-Lifshitz方程有效偶极边界条件阈值曲线色散曲线

The study of parallel pump microwave magnetic field instability threshold in metallic ferromagnetic strip under in-plane confinement

Using the Landau-Lifshitz equation, the propagating of spin wave in metallic magnetic stripe has been investigated, in which the effective boundary condition is applied for the dynamic magnetization of the metallic magnetic strip. The relationship between spin wave spectrum and width of the strip has analytically been derived. Numerical calculations show that in-plane confinement results in the obvious kinks in the threshold curves. And with the increase of strip width, the kink numbers almost rise exponentially, while the threshold jump at the first kink is nearly in inverse proportion to its width.