AI 中文总结
该研究利用弗洛凯理论，通过微波泵浦分析铁磁磁振子的共振激发，关注低于磁振子能量的驱动频率，建立理论框架预测共振区域等，与模拟比较，还能估计阈值振幅，实现低频驱动下的有针对性激发。
AI 中文摘要
我们使用弗洛凯理论分析了通过微波泵浦对铁磁磁振子的共振激发。特别关注低于相应磁振子能量的驱动频率，其可通过参量共振在大参数区域被激发。我们建立了一个理论框架，能解析预测铁磁和亚铁磁材料（如YIG）薄膜中共振区域和共振阈值与阻尼、振幅和频率的函数关系。共振区域由准能量的例外点分隔，结果与微磁模拟进行了比较。相应的阈值振幅可从具有阻尼的特征幂律估计，这使得利用低频驱动在选定波数下进行有针对性的激发成为可能。
英文摘要
We analyse resonant excitations of ferromagnetic magnons via microwave pumping using Floquet theory. Special focus is put on driving frequencies that are below the corresponding magnon energy, which can be excited in large parameter regions via parametric resonances. We develop a theoretical framework that analytically predicts the regions of resonances and resonance thresholds in thin films of ferro- and ferri-magnetic materials like YIG as a function of damping, amplitude and frequency. Resonance regions are separated by exceptional points of the quasi-energies and the results are compared with micromagnetic simulations. The corresponding threshold amplitudes can be estimated from a characteristic powerlaw with damping, leading to the possibility of targeted exciatations at selected wavenumbers using low frequency drive.
Comments8 pages, 5 figures
