垂直泵的结构对YIG单晶薄膜的第二级自旋波不稳定性临界场的影响

EFFECT OF THE PERPENDICULAR PUMPING CONFIGURATIONS ON THE SECOND-ORDER SPIN-WAVE INSTABILITY THRESHOLD IN SINGLE CRYSTAL YIG FILMS

本文采用Schlomann和Patton方法,进一步讨论铁氧体椭球样品的第二级自旋波不稳定性过程,给出薄膜样品的第二级自旋波不稳定性临界场的表示式,它与Anderson-Suhl公式有所不同。对YIG单晶薄膜样品在3种不同垂直泵结构下临界场的计算表明:对于3种结构计算的临界场与实验结果一致,而且理论上和实验上给出的临界场值与线性极化微波磁场的取向有密切关系。

This paper is to further discuss the second-order spin-wave instability processes for the ferrite sample of ellipsoidal shape using Schlomann and Patton methods. The theoretical expressions of the second-order spin-wave instability threshold for film samples are different from Anderson-Suhl formula. The threshold calculations for single crystal YIG films under three different perpendicular pumping configurations show that the calculated thresholds are reasonably consistent with the experimental results for three configurations, and the threshold values given theoretically and experimentally are in close relationship with the oreintation of the linearly polarized microwave magnetic field.