AI 中文总结
该研究通过实验与理论分析，揭示了强阻尼磁体中磁振子与SAW声子的耦合相位可由磁场调控，为研究磁振子-声子相互作用的新机制提供了新平台。
AI 中文摘要
我们研究磁性薄膜中磁振子与表面声波（SAW）声子之间耦合的相位。随着外磁场减小，耦合常数从实数变为复数。在低于临界磁场时，虚部耦合常数使SAW声子能与过阻尼磁振子耦合，这类磁振子的共振频率接近零，且远离SAW共振。虚部耦合常数的强度与临界磁场的大小均随磁阻尼缩放。我们在具有大磁阻尼的Ni/Ru/Ni合成反铁磁体中发现，该耦合会在近零磁场处的SAW透射谱产生一个宽而明显的极小值。这些结果表明，在强阻尼磁体中，可通过磁场调控复磁振子-声子耦合常数的相位，为探索磁振子-声子相互作用的新机制提供了平台。
英文摘要
We study the phase of the coupling between magnons and surface acoustic wave (SAW) phonons in magnetic thin films. The coupling constant changes from a real to a complex number as the external magnetic field is reduced. Below a transition field, the imaginary coupling constant allows SAW phonons to couple to overdamped magnons whose resonance frequency is close to zero and far from the SAW resonance. The strength of the imaginary coupling constant and the magnitude of the transition field both scale with magnetic damping. We find the coupling produces a broad, pronounced minimum in the SAW transmittance spectrum near zero magnetic field in a Ni/Ru/Ni synthetic antiferromagnet with large magnetic damping. These results demonstrate that the phase of the complex magnon-phonon coupling constant can be tuned via magnetic field in strongly damped magnets, offering a platform to explore novel regimes of magnon-phonon interactions.
