AI 中文总结
本研究以铁酸锂为对象，利用相干微波反馈抑制腔-磁振子极化激元耗散，首次观测到其腔磁振子力学现象，实现了极化激元线宽减小与磁振子力学协同度提升。
AI 中文摘要
铁酸锂（LiFe）是腔磁振子学领域极具前景的材料，其高自旋密度可实现磁振子与微波光子的强耦合，但其在腔磁振子力学方面的潜力尚未得到探索。本研究中，我们利用相干微波反馈抑制腔-磁振子极化激元的耗散，在单晶LiFe球中观测到了磁振子力学相互作用。在反馈不足时，狭窄的力学响应难以在宽得多的极化激元背景中分辨；增加反馈增益可减小极化激元线宽，同时相应提高磁振子力学协同度，呈现出清晰的磁振子力学诱导透明特征。在本次测量中，有效上极化激元线宽从无反馈时的$3.53~\text{MHz}$降至有反馈时的$5.8~\text{kHz}$，测得的协同度从$C=1.9\times10^{-3}$提升至$C=0.15$。据我们所知，这些测量首次在LiFe中观测到腔磁振子力学现象，证明相干反馈是获取因耗散而被掩盖的弱相互作用的可行途径。
英文摘要
Lithium ferrite (LiFe) is a promising material for cavity magnonics because its large spin density enables strong coupling between magnons and microwave photons. Its potential for cavity magnomechanics, however, has remained unexplored. Here, we observe magnomechanical interactions in a single-crystal LiFe sphere using coherent microwave feedback to suppress dissipation of the cavity--magnon polariton. In the absence of sufficient feedback, the narrow mechanical response is difficult to resolve against the much broader polariton background. Increasing the feedback gain reduces the polariton linewidth and correspondingly increases the magnomechanical cooperativity, revealing a clear magnomechanically induced transparency feature. In the measurements presented here, the effective upper-polariton linewidth is reduced from $3.53~\mathrm{MHz}$ without feedback to $5.8~\mathrm{kHz}$ in the presence of feedback, while the measured cooperativity increases from $C=1.9\times10^{-3}$ to $C=0.15$. These measurements provide, to our knowledge, the first observation of cavity magnomechanics in LiFe and demonstrate coherent feedback as a practical route for accessing weak interactions that would otherwise be obscured by dissipation.
