The features of spin-wave propagation in a magnonic superlattice are investigated theoretically and experimentally. This superlattice consists of periodic metallic gratings, having two non-equal periods located at the surface of the ferromagnetic film. It is shown that two band gaps are formed in the spin-waves spectrum within the first Bragg zone. A theoretical model using a coupled waves model and equating magnetic permeabilities at the surface boundaries demonstrating the mechanism of band structure formation was developed. Experimental data obtained with microwave and Brillouin light scattering techniques are in good agreement with theoretical results.

中文翻译：

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大型布拉格光栅超晶格的能带结构形成。

从理论上和实验上研究了自旋波在镁铁超晶格中的传播特征。该超晶格由周期性的金属光栅组成，该周期性的金属光栅在铁磁膜的表面具有两个不相等的周期。结果表明，在第一布拉格区内的自旋波谱中形成了两个带隙。建立了使用耦合波模型并在表面边界处等效磁导率的理论模型，证明了能带结构的形成机理。用微波和布里渊光散射技术获得的实验数据与理论结果非常吻合。