Reconfigurable spin current transmission and magnon–magnon coupling in hybrid ferrimagnetic insulators

Journal Article · 12 March 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-46330-8 · OSTI ID:2335725

Li, Yan  ^[1]; Zhang, Zhitao ^[2]; Liu, Chen ^[1]; Zheng, Dongxing  ^[1]; Fang, Bin ^[1]; Zhang, Chenhui ^[1]; Chen, Aitian  ^[1]; Ma, Yinchang  ^[1]; Wang, Chunmei ^[2]; Liu, Haoliang  ^[2]; Shen, Ka  ^[3]; Manchon, Aurélien  ^[4]; Xiao, John Q.  ^[5]; Qiu, Ziqiang  ^[6]; Hu, Can-Ming ^[7]; Zhang, Xixiang  ^[1]

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1. King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)
2. Harbin Institute of Technology, Shenzhen (China)
3. Beijing Normal University (China)
4. Aix-Marseille Univ., Marseille (France)
5. University of Delaware, Newark, DE (United States)
6. University of California at Berkeley, CA (United States)
7. University of Manitoba, Winnipeg (Canada)

Coherent spin waves possess immense potential in wave-based information computation, storage, and transmission with high fidelity and ultra-low energy consumption. However, despite their seminal importance for magnonic devices, there is a paucity of both structural prototypes and theoretical frameworks that regulate the spin current transmission and magnon hybridization mediated by coherent spin waves. Here, we demonstrate reconfigurable coherent spin current transmission, as well as magnon–magnon coupling, in a hybrid ferrimagnetic heterostructure comprising epitaxial Gd₃Fe₅O₁₂ and Y₃Fe₅O₁₂ insulators. By adjusting the compensated moment in Gd₃Fe₅O₁₂, magnon–magnon coupling was achieved and engineered with pronounced anticrossings between two Kittel modes, accompanied by divergent dissipative coupling approaching the magnetic compensation temperature of Gd₃Fe₅O₁₂ (T_M,GdIG), which were modeled by coherent spin pumping. Remarkably, we further identified, both experimentally and theoretically, a drastic variation in the coherent spin wave-mediated spin current across T_M,GdIG, which manifested as a strong dependence on the relative alignment of magnetic moments. Our findings provide significant fundamental insight into the reconfiguration of coherent spin waves and offer a new route towards constructing artificial magnonic architectures.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC); National Natural Science Foundation of China
• Grant/Contract Number: AC02-05CH11231
• OSTI ID: 2335725
• Journal Information: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723
• Publisher: Nature Publishing GroupCopyright Statement
• Country of Publication: United States
• Language: English