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

Yan Li, Zhitao Zhang, Chen Liu, Dongxing Zheng, Bin Fang, Chenhui Zhang, Aitian Chen, Yinchang Ma, Chunmei Wang, Haoliang Liu (), Ka Shen (), Aurélien Manchon, John Q. Xiao, Ziqiang Qiu, Can-Ming Hu and Xixiang Zhang ()
Additional contact information
Yan Li: King Abdullah University of Science and Technology (KAUST)
Zhitao Zhang: Harbin Institute of Technology (Shenzhen)
Chen Liu: King Abdullah University of Science and Technology (KAUST)
Dongxing Zheng: King Abdullah University of Science and Technology (KAUST)
Bin Fang: King Abdullah University of Science and Technology (KAUST)
Chenhui Zhang: King Abdullah University of Science and Technology (KAUST)
Aitian Chen: King Abdullah University of Science and Technology (KAUST)
Yinchang Ma: King Abdullah University of Science and Technology (KAUST)
Chunmei Wang: Harbin Institute of Technology (Shenzhen)
Haoliang Liu: Harbin Institute of Technology (Shenzhen)
Ka Shen: Beijing Normal University
Aurélien Manchon: Aix-Marseille Univ, CNRS, CINaM
John Q. Xiao: University of Delaware, Newark
Ziqiang Qiu: University of California at Berkeley
Can-Ming Hu: University of Manitoba
Xixiang Zhang: King Abdullah University of Science and Technology (KAUST)

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract 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 (TM,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 TM,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.

Date: 2024
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DOI: 10.1038/s41467-024-46330-8

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