微带换能器从平行到垂直参量泵浦的场致转变
Field-induced transition from parallel to perpendicular parametric pumping for a microstrip transducer
摘要：
用于在磁性薄膜中激发自旋波的微带换能器具有两个特征性质：微波磁场的高度空间局部化和平行于和垂直于偏置场的场分量的存在。在这里，这些功能上的参数泵浦过程的影响。通过对自旋波不稳定性阈值的微波测量，观察到在临界场$H_{\rm c}$处由平行泵浦到垂直泵浦的转变，并得到最小阈值。由于泵浦区的空间限制，这种转变伴随着临界场以上的急剧阈值增加。
英文摘要：
Microstrip transducers used for the excitation of spin waves in magnetic films possess two characteristic properties: high spatial localization of the microwave magnetic field and the presence of field components parallel and perpendicular to the bias field. Here, the effects of these features on the process of parametric pumping are presented. By microwave measurements of the spin-wave instability threshold a transition from parallel pumping to perpendicular pumping at the critical field $H_{\rm c}$ with the minimal threshold is observed. This transition is accompanied by a sharp threshold increase above the critical field due to the spatial confinement of the pump region.
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