发表机构
Universidade Federal Rural de Pernambuco; Universidade Federal de Pernambuco（巴西国立农村联邦大学; 巴西国立联邦大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
首次实验观测到铁磁/压电双层中磁子泵浦引起的共振增强声子输运，证实频率选择性磁子-声子耦合，为混合平台主动控制声学输运提供新机制。
AI 中文摘要
我们报告了在铁磁/压电双层结构中，由磁子泵浦引起的共振增强传播声子输运的首次实验观测。在128°Y切LiNbO₃延迟线器件中产生的表面声波（SAWs）通过磁弹性耦合共振激发相邻Co薄膜中的磁化动力学。当SAW频率满足由Kittel色散关系预测的铁磁共振条件时，透射声学信号的增强才发生，这提供了共振磁子-声子耦合的直接实验指纹。对Co/LiNbO₃双层结构与裸LiNbO₃衬底的系统比较表明，观察到的透射增强完全源于传播声子与相干磁化进动之间的动态相互作用。此外，在不同SAW谐波下进行的测量揭示，只有满足FMR条件的谐波才产生可测量的增强，证实了该现象的频率选择性。这些发现建立了一种从磁子向传播声子转移能量的高效机制，并为在混合自旋电子学、应变电子学和量子声子学平台中主动控制相干声学输运提供了新策略。
英文摘要
We report the first experimental observation of resonantly enhanced propagating phonon transport induced by magnon pumping in a ferromagnetic/piezoelectric bilayer. Surface acoustic waves (SAWs) generated in a 128$^{\circ}$ Y-cut LiNbO$_3$ delay-line device resonantly excite magnetization dynamics in an adjacent Co film through magnetoelastic coupling. The enhancement of the transmitted acoustic signal occurs exclusively when the SAW frequency satisfies the ferromagnetic resonance condition predicted by the Kittel dispersion, providing a direct experimental fingerprint of resonant magnon-phonon coupling. A systematic comparison between the Co/LiNbO$_3$ bilayer and the bare LiNbO$_3$ substrate demonstrates that the observed transmission enhancement originates solely from the dynamic interaction between propagating phonons and coherent magnetization precession. Furthermore, measurements performed at different SAW harmonics reveal that only the harmonic satisfying the FMR condition produces a measurable enhancement, confirming the frequency-selective nature of the phenomenon. These findings establish an efficient mechanism for transferring energy from magnons to propagating phonons and provide a new strategy for actively controlling coherent acoustic transport in hybrid spintronic, straintronic, and quantum phononic platforms.
