| SPECIAL TOPIC — Advanced magnonics |
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Strong magnon-photon coupling in on-chip CoFe/LiNbO3 hybrid nanostructures |
| Jinlong Wang(王锦龙)1,2,†, Rundong Yuan(袁润东)3,†, Manuel Mueller4,5, Luis Flacke4,5, Hanchen Wang(王涵晨)6, Kanglin Yu(俞康麟)1,2, Junfeng Hu(胡俊峰)1, Fenglin Zhong(钟丰麟)7, Jilei Chen(陈济雷)1, Mathias Weiler8, Matthias Althammer4,5,‡, and Haiming Yu(于海明)1,2,§ |
1 International Quantum Academy, Shenzhen 518048, China;
2 Fert Beijing Institute, MIIT Key Laboratory of Spintronics, School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, China;
3 TCM Group, Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom;
4 Walther-Meibner-Institut, Bayerische Akademie der Wissenschaften, Garching 85748, Germany;
5 TUM School of Natural Sciences, Technical University of Munich, Garching 85748, Germany;
6 Department of Materials, ETH Zurich, Zurich 8093, Switzerland;
7 CDT in Superconductivity, Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom;
8 Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universitat Kaisersläutern, Kaiserslautern 67663, Germany |
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Abstract We demonstrate strong magnon-photon coupling using on-chip arrays of ferromagnetic CoFe nanowires fabricated on a dielectric lithium niobate substrate. A large coupling strength of 1.1 GHz and a cooperativity of 3.1 at a frequency of 24.5 GHz are achieved in CoFe nanowires with a volume of 110 μm$^{3}$, facilitated by the enhanced spin-photon interaction at the single-spin level. The measured spectra are analyzed using a semiclassical theoretical model that combines the Landau-Lifshitz equation with Maxwell's equations. Our results provide an on-chip approach to integrated hybrid magnonics based on nanomagnets, offering promising routes for the development of coherent information-processing devices.
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Received: 10 November 2025
Revised: 12 December 2025
Accepted manuscript online: 16 December 2025
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PACS:
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75.78.-n
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(Magnetization dynamics)
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76.50.+g
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(Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)
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52.35.Mw
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(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))
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71.36.+c
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(Polaritons (including photon-phonon and photon-magnon interactions))
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| Fund: This project was supported by the National Key Research and Development Program of China (Grant No. 2022YFA1402801), the National Natural Science Foundation of China (Grant Nos. 12525406, 12474104, 12074026, and 52225106), the China Scholarship Council (CSC) Scholarship (Grant Nos. 202408060249 and 202206020091), the Cambridge Commonwealth, European, and International Trust, the Shenzhen Science and Technology Program (Grant No. RCBS20231211090814026), and the EPSRC Centre for Doctoral Training in Superconductivity (Grant No. EP/Y035453/1). |
Corresponding Authors:
Matthias Althammer, Haiming Yu
E-mail: matthias.althammer@wmi.badw.de;haiming.yu@buaa.edu.cn
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Cite this article:
Jinlong Wang(王锦龙), Rundong Yuan(袁润东), Manuel Mueller, Luis Flacke, Hanchen Wang(王涵晨), Kanglin Yu(俞康麟), Junfeng Hu(胡俊峰), Fenglin Zhong(钟丰麟), Jilei Chen(陈济雷), Mathias Weiler, Matthias Althammer, and Haiming Yu(于海明) Strong magnon-photon coupling in on-chip CoFe/LiNbO3 hybrid nanostructures 2026 Chin. Phys. B 35 047503
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