AI 中文总结
该研究针对GGG衬底上的3μm厚YIG薄膜，通过铁磁共振和有限元模拟揭示其条纹畴态中磁振子-声子弱耦合源于相位与畴符号抵消，确立磁织构可作为磁振子-声子耦合的控制参数。
AI 中文摘要
我们研究了生长在GGG衬底上的3μm厚YIG薄膜的条纹畴磁态中的磁弹耦合。宽带铁磁共振揭示了由与磁场无关的声子梳调制的低频条纹畴磁振子分支，其频率间距为3.5MHz，与GGG衬底受限厚度剪切模式的预测值匹配。分析拟合得到耦合率在0.33至0.54MHz之间，协同度为10⁻¹量级，表明系统处于弱耦合 regime，无分辨出的反交叉间隙。使用有限元模拟进行的磁振子-声子模式重叠计算显示，弱耦合源于相位和畴符号抵消：局部磁弹耦合相当大，但超过99%的相干重叠在条纹织构中抵消。完全耦合模拟进一步证明了声子介导的远程YIG层激发，并表明高效的传播声子产生需要空间不对称的磁振子模式，确立了磁织构作为磁振子-声子耦合的控制参数。
英文摘要
We study magnetoelastic coupling in stripe-domain magnetic states of $3\,\mathrm{μm}$-thick YIG thin films grown on a GGG substrate. Broadband ferromagnetic resonance reveals low-frequency stripe-domain magnon branches modulated by a field-independent phonon comb with a frequency spacing of $3.5\,\mathrm{MHz}$, matching the value predicted for confined thickness-shear modes of the GGG substrate. Analytical fitting yields coupling rates that vary between $0.33$--$0.54\,\mathrm{MHz}$ and cooperativities of order $10^{-1}$, indicating that the system is in the weak-coupling regime without resolvable avoided-crossing gaps. Magnon-phonon mode-overlap calculations using finite-element simulations show that the weak coupling arises from phase and domain-sign cancellation: the local magnetoelastic coupling is sizable, but more than $99\%$ of the coherent overlap cancels across the stripe texture. Fully coupled simulations further demonstrate phonon-mediated excitation of a remote YIG layer and show that efficient propagating-phonon generation requires spatially asymmetric magnon modes, establishing magnetic texture as a control parameter for magnon--phonon coupling.
Comments9 pages, 5 figures
