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Research Article

Nonreciprocal coherent coupling of nanomagnets by exchange spin waves

Hanchen Wang1,§, Jilei Chen1,§, Tao Yu2,§, Chuanpu Liu1,§, Chenyang Guo3,§, Song Liu4,§, Ka Shen5,§, Hao Jia4,§, Tao Liu6, Jianyu Zhang1, Marco A. Cabero Z4,1, Qiuming Song4, Sa Tu1, Mingzhong Wu6, Xiufeng Han3, Ke Xia4, Dapeng Yu4, Gerrit E. W. Bauer7,8,9, Haiming Yu1( )
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
Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
Shenzhen Institute for Quantum Science and Engineering (SIQSE), and Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
Department of Physics, Beijing Normal University, Beijing 100875, China
Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
Institute for Materials Research, WPI-AIMR and CSNR, Tohoku University, Sendai 980-8577, Japan
Zernike Institute for Advanced Materials, University of Groningen, Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

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

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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.

Keywords

spintronicsnanomagnetsspin wavescoherent couplingnonreciprocity

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Nano Research
Volume 14 Issue 7,
July 2021
Pages 2133-2138
DOI: 10.1007/s12274-020-3251-5
Cite this article:
Wang H, Chen J, Yu T, et al. Nonreciprocal coherent coupling of nanomagnets by exchange spin waves. Nano Research, 2021, 14(7): 2133-2138. https://doi.org/10.1007/s12274-020-3251-5
Topics:
Computation theory Nanomagnatics

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Received: 01 August 2020
Revised: 10 November 2020
Accepted: 16 November 2020
Published: 05 July 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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