Strong magnon-magnon coupling and low dissipation rate in an all-magnetic-insulator heterostructure
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.
Authors
- Zheyu Ren (ORCID: https://orcid.org/0000-0001-6301-9524)
- Xuezhao Wu
- Qiming Shao (ORCID: https://orcid.org/0000-0003-2613-3031)
- Jingming Liang (ORCID: https://orcid.org/0000-0001-6751-0169)
- Shun Kong Cheung (ORCID: https://orcid.org/0000-0001-8223-6815)
- Yuzan Xiong (ORCID: https://orcid.org/0009-0005-6151-1300)
- Xixiang Zhang (ORCID: https://orcid.org/0000-0002-3478-6414)
- Ruizi Liu (ORCID: https://orcid.org/0000-0002-6645-1096)
- Ferris Prima Nugraha (ORCID: https://orcid.org/0009-0005-2177-144X)
- Chen Liu (ORCID: https://orcid.org/0000-0003-1481-6484)
- Yifan Liu (ORCID: https://orcid.org/0000-0003-3123-8903)
- Jiacheng Liu (ORCID: https://orcid.org/0000-0001-8377-4375)
- Wei Zhang (ORCID: https://orcid.org/0000-0002-8076-1066)
- Zehan Chen (ORCID: https://orcid.org/0000-0001-9161-1269)
- Andrew Christy (ORCID: https://orcid.org/0000-0001-8574-2510)
- Dennis Chi Wah Leung
Institutions
- University of North Carolina at Chapel Hill (US)
- Hong Kong Polytechnic University (HK)
- Hong Kong University of Science and Technology (HK)
- King Abdullah University of Science and Technology (SA)
Publication Details
- Journal
- Physical Review Applied
- Published
- 2024-09-09
- DOI
- https://doi.org/10.1103/physrevapplied.22.034017
- Citations
- 10
- Primary Topic
- Magnetic properties of thin films
- Type
- article
- Field-Weighted Citation Impact
- 3.38
Funders
- National Science Foundation
- Hong Kong University of Science and Technology
- National Key Research and Development Program of China
- State Key Laboratory of Advanced Displays and Optoelectronics Technologies, Hong Kong University of Science and Technology