Photon-mediated magnon-magnon coupling between spatially separated Yttrium Iron Garnet (YIG) and permalloy (NiFe) thin films on a planar hexagonal ring resonator shows clear signatures of magnon-magnon interaction are observed without direct dipolar interaction between the magnetic films. The coupling strength between the hexagonal ring resonator and the permalloy film increases with the thickness of the YIG film, despite a fixed permalloy film thickness. This suggests the presence of an indirect interaction channel mediated by resonator photons. A theoretical model is presented that accurately reproduces the observed transmission spectra and reveals a nontrivial interdependence between the individual coupling strengths of YIG and permalloy to the resonator. These results highlight the importance of indirect interactions and potential crosstalk pathways in designing hybrid magnonic systems and scalable quantum architectures, while demonstrating the feasibility of cost-effective, planar configurations for experimental implementation. These insights are valuable for advancing low-loss, coherent information transfer in hybrid quantum devices.
Nanoscale Detection of Magnon Excitations with Variable Wavevectors Through a Quantum Spin Sensor
本文报道了利用近场氮空位（NV）单自旋传感器对磁性绝缘体Y3 Fe 5 O 12薄膜中具有宽波矢范围的磁振子的光学探测。通过多磁振子散射过程，激发的磁振子在NV电子自旋共振频率处产生起伏的磁场，这加速了NV自旋的弛豫。通过测量NV中心发射的自旋相关光致发光的变化，可以光学地访问具有高达~ 5 x 10^7 m-1的可变波矢的磁振子，从而提供另一种视角来揭示磁性系统中的潜在自旋行为。我们的研究结果突出了NV单自旋量子传感器在探索新兴自旋电子材料的纳米级自旋动力学提供的重要机会。
