任意偏置磁場中微波靜磁波傳播特性

研究了任意傾斜的直流偏置磁場作用下磁光薄膜中激發(fā)的微波靜磁波傳播規(guī)律，為下一步分析基于靜磁波的磁光Bragg器件衍射性能提供基礎。計算了YIG薄膜中傳播的靜磁正向體波特性，結果表明：在傾斜偏置磁場中沿不同方向激發(fā)的靜磁波具有不同的輻射阻抗，這與垂直磁化情形明顯不同；適當傾斜偏置磁場可降低靜磁波的插入損耗，從而可增強靜磁波對導波光的衍射效應。

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.