Deng G J, Wang D H
Key Laboratory of Advanced Science and Technology on High Power Microwave, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024, China.
National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory for Nanotechnology and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
Rev Sci Instrum. 2023 Sep 1;94(9). doi: 10.1063/5.0155923.
The knowledge of physical mechanism of microwave generation in coaxial gyromagnetic nonlinear transmission lines (GNLTLs) is not complete up until now, especially the action of spinwave excitation during this process. In this paper, control experiments on different groups of GNLTLs with a single variable of NiZn ferrite material spinwave linewidth ΔHk are proposed as an indirect way to demonstrate this microscopic process. Comparative analyses of different groups of GNLTL experimental results are conducted to clarify the existence and effect of spinwave excitation. Theoretical treatment of conditions of spinwave excitation in GNLTLs is derived to explain the experimental results. It is illustrated that spinwave can be excited when the synchronism condition between the working frequency of GNLTL and the spinwave frequency spectrum is satisfied. The unstable spinwave excitation will consume the RF energy of GNLTLs heavily and cause a rapid decrease in RF oscillation.
直到现在，人们对同轴回旋磁非线性传输线（GNLTLs）中微波产生的物理机制的了解还不完整，尤其是在此过程中自旋波激发的作用。本文提出了对不同组的GNLTLs进行控制实验，以NiZn铁氧体材料自旋波线宽ΔHk作为单一变量，作为证明这一微观过程的间接方法。对不同组的GNLTL实验结果进行了比较分析，以阐明自旋波激发的存在及其作用。推导了GNLTLs中自旋波激发条件的理论处理方法，以解释实验结果。结果表明，当GNLTL的工作频率与自旋波频谱之间的同步条件得到满足时，自旋波就可以被激发。不稳定的自旋波激发会大量消耗GNLTLs的射频能量，并导致射频振荡迅速下降。
