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Chin. Phys. B, 2026, Vol. 35(4): 047505    DOI: 10.1088/1674-1056/ae48c1
SPECIAL TOPIC — Advanced magnonics Prev   Next  

Efficient magnon transport and magnon torque through the epitaxial antiferromagnetic insulator α-Fe2O3

Donglin Song(宋东霖)1,2,†, Fanyu Meng(孟凡毓)1,2,†, Mingyang Sun(孙铭扬)1,2, Hongrui Ni(倪泓睿)1,2, Jinhao Zou(邹锦豪)2, Zichen Yao(姚子忱)2, Zhenlong Guo(郭振龙)1,2, Yichi Zhang(张一驰)1,2, Liyan Zhang(张丽艳)3, Hongliang Bai(白洪亮)1, Wenping Zhou(周文平)4, and Yi Wang(王译)1,2,‡
1 Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China;
2 School of Physics, Dalian University of Technology, Dalian 116024, China;
3 School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China;
4 Inner Mongolia Key Laboratory of Microscale Physics and Atom Innovation, and Research Center for Quantum Physics and Technologies, Inner Mongolia University, Hohhot 010021, China
Abstract  Magnons, as key carriers of spin angular momentum, enable spin transport without charge movement in magnetic insulators, thereby greatly reducing Joule heating in spintronic devices. Magnon-mediated spin torque (i.e., magnon torque) provides an alternative approach for efficient magnetization manipulation. However, magnon transmission through antiferromagnetic insulators still suffers from notable propagation losses, limiting the efficiency of magnon torque. Here, we fabricate high-quality epitaxial $\alpha $-Fe$_{2}$O$_{3}$ thin films by magnetron sputtering that exhibit strong antiferromagnetic ordering, and successfully demonstrate highly efficient magnon transport and magnon torque in Pt/$\alpha $-Fe$_{2}$O$_{3}$/NiFe devices at room temperature. It is observed that magnons propagate through a 20-nm-thick $\alpha $-Fe$_{2}$O$_{3}$ layer with a significantly enhanced transmission efficiency of 75 %, about 2.5 times higher than that in previously reported NiO-based magnonic devices. Consequently, a pronounced magnon torque is exerted on the adjacent ferromagnetic layer. Our work demonstrates that $\alpha $-Fe$_{2}$O$_{3}$ is a promising antiferromagnetic material for efficient magnon channels, advancing the study of energy-efficient, high-speed magnonic devices.
Keywords:  a-Fe2O3      spin-torque ferromagnetic resonance      magnon torque      efficient magnon transport  
Received:  20 December 2025      Revised:  09 February 2026      Accepted manuscript online:  23 February 2026
PACS:  75.76.+j (Spin transport effects)  
  75.50.Ee (Antiferromagnetics)  
  75.30.Ds (Spin waves)  
  76.50.+g (Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. T2495211, 12261131506, 12074052, and 12504121), the Natural Science Foundation of Liaoning Province of China (Grant Nos. 2021-YQ-06 and 2025-BS-0077), the Open Fund of the State Key Laboratory of Spintronics Devices and Technologies (Grant No. SPL- 2410), and the Fundamental Research Funds for the Central Universities (Grant Nos. DUT24GJ204, DUT25Z2746, and DUT25RC(3)066).
Corresponding Authors:  Yi Wang     E-mail:  yiwang@dlut.edu.cn

Cite this article: 

Donglin Song(宋东霖), Fanyu Meng(孟凡毓), Mingyang Sun(孙铭扬), Hongrui Ni(倪泓睿), Jinhao Zou(邹锦豪), Zichen Yao(姚子忱), Zhenlong Guo(郭振龙), Yichi Zhang(张一驰), Liyan Zhang(张丽艳), Hongliang Bai(白洪亮), Wenping Zhou(周文平), and Yi Wang(王译) Efficient magnon transport and magnon torque through the epitaxial antiferromagnetic insulator α-Fe2O3 2026 Chin. Phys. B 35 047505

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