Strong magnon-magnon coupling and low dissipation rate in an all-magnetic-insulator heterostructure

作者：Jiacheng Liu, Yuzan Xiong, Jingming Liang, Xuezhao Wu, Chen Liu, Shun Kong Cheung, Zheyu Ren, Ruizi Liu, Andrew Christy, Zehan Chen, Yifan Liu, Ferris Prima Nugraha, Xixiang Zhang, Dennis Chi Wah Leung, Wei Zhang, Qiming Shao · 发表于：Physical Review Applied · 年份：2024 · DOI：10.1103/physrevapplied.22.034017 · 被引用次数：13 · 研究领域：Magnetic properties of thin films、Physics of Superconductivity and Magnetism、Magnetic and transport properties of perovskites and related materials

Magnetic insulators, such as yttrium iron garnets (YIGs), are important for spin-wave or magnonic devices as their low damping enables low-power dissipation. Magnetic insulator heterostructures can offer larger design space for realizing exotic magnonic quantum states, provided that individual layers have low damping and their exchange coupling is strong and engineerable. Here, we show that, in a high-quality all-insulator thulium iron garnet (TmIG)/YIG bilayer system, TmIG exhibits an ultralow dissipation rate thanks to its low-damping, low-saturation magnetization and strong orbital momentum. The low dissipation rates in both YIG and TmIG, along with their significant coupling strength due to interfacial exchange coupling, enable strong and coherent magnon-magnon coupling. The coupling strength can be tuned by varying the magnetic insulator layer thickness and magnon modes, which is consistent with analytical calculations and micromagnetic simulations. Our results demonstrate TmIG/YIG as a novel platform for investigating hybrid magnonic phenomena and open opportunities for magnon devices comprising all-insulator heterostructures.