多层窄样品中静磁表面波宽度模的色散特性研究

Study on Dispersion of Magneto-Static Surface Wave Wide Modes Propagating in Multilayer Samples with Narrow Width

本文建立了具有任意参数多层薄膜结构的窄样品中静磁表面波宽度模的普遍色散关系 ,适用于利用多层薄膜控制静磁表面波色散特性的所有情况 .对两周期 [(YIG/GGG) n/metal]多层膜结构窄样品中静磁表面波宽度模的色散特性进行了数值计算 ,得到了多层膜中的高阶宽度模式 ,多层薄膜结构的参数可以有效地控制静磁表面波的色散特性 ,样品宽度效应对色散也有明显的影响 .根据数值计算结果对不同宽度的YIG薄膜样品在 4 2～ 5 2GHz的频率范围进行实验 ,实验测试结果与理论分析相吻合 .

In this paper,the general dispersion relation of Magetostatic Surface Wave (MSSW ) wide modes propagating in narrow YIG (Yttrium iron garnet) multilayer sample w ith arbitrary paramete rs is constructed.The theory is suitable to research all the situations of MSSW dispersion controlled by multilayer films and is better in agreement with the ac tual situations.The dispersion of MSSW wide mode in 2 period [(YIG/GGG(Gadolini um gallium garnet)) n/metal] multilayer films with finite width was numericall y investigated by applying the theory and high order wide modes in finite sample were derived.Numerical resu lts show that the dispersion of MSSW wide mode can be controlled efficiently by means of changing the parameters of the multilayer and also influenced by sample width.Experiments were performed at frequency range 4 2～5 2 GHz in YIG multi layer samples of different width and the experimental results are coincident wit h the theoretical analysis.