任意偏置磁场中微波静磁波传播特性

研究了任意倾斜的直流偏置磁场作用下磁光薄膜中激发的微波静磁波传播规律，为下一步分析基于静磁波的磁光Bragg器件衍射性能提供基础。计算了YIG薄膜中传播的静磁正向体波特性，结果表明：在倾斜偏置磁场中沿不同方向激发的静磁波具有不同的辐射阻抗，这与垂直磁化情形明显不同；适当倾斜偏置磁场可降低静磁波的插入损耗，从而可增强静磁波对导波光的衍射效应。

The propagation characteristics of microwave magnetostatic waves (MSWs) in the magnetic film under arbitrary DC bias field are analyzed. The bandwidth, radiation resistance and insertion loss of magnetostatic forward waves propagated in the YIG film are calculated. It is indicated that under arbitrarily inclined magnetic field the radiation resistance of MSWs propagating in the different direction are not equal, which is obviously different from the case of normal magnetization; and that the insertion loss can be decreased under appropriately inclined bias magnetic field, so that the diffraction effect of guided optical waves in MSW-based Bragg cells is also enhanced.