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Nonreciprocal coherent coupling of nanomagnets by exchange spin waves

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Abstract

Nanomagnets are widely used to store information in non-volatile spintronic devices. Spin waves can transfer information with low-power consumption as their propagations are independent of charge transport. However, to dynamically couple two distant nanomagnets via spin waves remains a major challenge for magnonics. Here we experimentally demonstrate coherent coupling of two distant Co nanowires by fast propagating spin waves in an yttrium iron garnet thin film with sub-50 nm wavelengths. Magnons in two nanomagnets are unidirectionally phase-locked with phase shifts controlled by magnon spin torque and spin-wave propagation. The coupled system is finally formulated by an analytical theory in terms of an effective non-Hermitian Hamiltonian. Our results are attractive for analog neuromorphic computing that requires unidirectional information transmission.

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Acknowledgements

The authors thank L. Flacke, M. Althammer, M. Weiler, K. Schultheiss, H. Schultheiss, M. Madami, G. Gubbiotti and C. M. Hu for their helpful discussions. Funding: We wish to acknowledge the support by the National Key Research and Development Program of China (Nos. 2016YFA0300802 and 2017YFA0206200), the National Natural Science Foundation of China (NSFC) (Nos. 11674020, 12074026 and U1801661), and the 111 talent program B16001. G. B. was supported by the Netherlands Organization for Scientific Research (NWO) and Japan Society for the Promotion of Science Kakenhi Grants-in-Aid for Scientific Research (No. 19H006450). T. Y. was funded through the Emmy Noether Program of Deutsche Forschungsgemeinschaft (SE 2558/2-1). K. X. thanks the National Key Research and Development Program of China (Nos. 2017YFA0303304 and 2018YFB0407601) and the National Natural Science Foundation of China (Nos. 61774017 and 11734004). K. S. was supported by the Fundamental Research Funds for the Central Universities (No. 2018EYT02). M. Z. W. were supported by the US National Science Foundation (No. EFMA-1641989).

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Author notes

  1. Hanchen Wang, Jilei Chen, Tao Yu, Chuanpu Liu, Chenyang Guo, Song Liu, Ka Shen and Hao Jia contributed equally to this work.

Authors and Affiliations

  1. Fert Beijing Institute, School of Integrated Circuit Science and Engineering, Beijing Advanced Innovation Center for Big Data and Brain Computing, Beihang University, Beijing, 100191, China

    Hanchen Wang, Jilei Chen, Chuanpu Liu, Jianyu Zhang, Marco A. Cabero, Sa Tu & Haiming Yu

  2. Max Planck Institute for the Structure and Dynamics of Matter, 22761, Hamburg, Germany

    Tao Yu

  3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, China

    Chenyang Guo & Xiufeng Han

  4. Shenzhen Institute for Quantum Science and Engineering (SIQSE), and Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China

    Song Liu, Hao Jia, Marco A. Cabero, Qiuming Song, Ke Xia & Dapeng Yu

  5. Department of Physics, Beijing Normal University, Beijing, 100875, China

    Ka Shen

  6. Department of Physics, Colorado State University, Fort Collins, Colorado, 80523, USA

    Tao Liu & Mingzhong Wu

  7. Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ, Delft, The Netherlands

    Gerrit E. W. Bauer

  8. Institute for Materials Research, WPI-AIMR and CSNR, Tohoku University, Sendai, 980-8577, Japan

    Gerrit E. W. Bauer

  9. Zernike Institute for Advanced Materials, University of Groningen, Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands

    Gerrit E. W. Bauer

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  1. Hanchen Wang
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  7. Ka Shen
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  8. Hao Jia
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  9. Tao Liu
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Wang, H., Chen, J., Yu, T. et al. Nonreciprocal coherent coupling of nanomagnets by exchange spin waves. Nano Res. 14, 2133–2138 (2021). https://doi.org/10.1007/s12274-020-3251-5

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  • DOI: https://doi.org/10.1007/s12274-020-3251-5

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