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Generation of twisted magnons via spin-to-orbital angular momentum conversion

Z.-X. Li, Zhenyu Wang, Yunshan Cao, and Peng Yan
Phys. Rev. B 105, 174433 – Published 26 May 2022
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  • INTRODUCTION
  • MODEL AND METHOD
  • RESULTS
  • DISCUSSION AND CONCLUSION
  • ACKNOWLEDGMENTS
    • References

    Abstract

    Twisted magnons (TMs) carrying orbital angular momentum (OAM) have attracted growing interest from the magnonic community. The fabrication of such a novel magnon state, however, is still challenging. Here we present a simple method to generate TMs with arbitrary radial and azimuthal quantum numbers through the spin-to-orbital angular momentum conversion. The conversion rate from plane-wave magnons to twisted ones is shown to be insensitive to the quantum index. The spectrum of TMs in thin nanodisks is solved analytically, showing good agreement with micromagnetic simulations. Moreover, we numerically study the propagation of TMs in magnetic nanodisk arrays and obtain the quantitative dependence of the decay length on quantum indices. Our results are helpful for realizing TMs with large OAMs that are indispensable for future high-capacity magnonic communication and computing.

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    • Received 10 March 2022
    • Revised 23 April 2022
    • Accepted 13 May 2022

    DOI:https://doi.org/10.1103/PhysRevB.105.174433

    ©2022 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Magnons
    1. Physical Systems
    Nanodisks
    1. Properties
    Angular momentum
    1. Techniques
    Landau-Lifschitz-Gilbert equationMicromagnetic modeling
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    Z.-X. Li, Zhenyu Wang, Yunshan Cao, and Peng Yan*

    • School of Electronic Science and Engineering, State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China

    • *Corresponding author: yan@uestc.edu.cn

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    Issue

    Vol. 105, Iss. 17 — 1 May 2022

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    Images

    • Figure 1
      Figure 1

      (a) The magnitude of the coefficient determinant versus trial frequencies for l=3 by theoretical calculations. (b) The spatial distribution of TM modes with different radial quantum numbers s=0–3 for a fixed OAM quantum number (l=3) in the nanodisk. (c) The temporal Fourier spectrum for magnetization component mx of the nanodisk from micromagnetic simulations. (d) Dependence of the intrinsic frequencies of TMs on l for different s, the dashed and solid lines denote the results from theoretical calculations and micromagnetic simulations, respectively.

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    • Figure 2
      Figure 2

      Illustration of the generation of TM via the spin-to-orbital angular momentum conversion at (a) t=0.02ns, (b) 0.22 ns and (c) 2.02 ns. A uniform static magnetic field is applied along the z-axis direction to perpendicularly magnetize the YIG thin film. The red arrow denotes the position of the sinusoidal driving field with frequency f=28.29GHz, and the purple circular arrow represents the rotation direction of TM in the nanodisk.

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    • Figure 3
      Figure 3

      Dependence of the TM amplitude on time with different s for (a) a fixed l (l=2) and (b) different l for a fixed s (s=1). The insets plot the spatial distribution of different TM modes. (c) TM amplitudes under different l and s. (d) The conversion rate from planar magnons to TMs varying with l for different s. The gray line represents the universal number 6%.

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    • Figure 4
      Figure 4

      (a) The sketch map of a one-dimensional nanodisk array. The blue arrow indicates the position of the applied excitation. Dependence of the TM amplitudes on the propagation distance with (b) different s for a fixed l (l=4) and (c) different l for a fixed s (s=3). Small balls denote simulation results, and solid lines represent the analytical fittings. (d) Dependence of the attenuation length λ on l for different s. (e) The spatial distribution of TM intensity in the nanodisk array for four representative TM modes.

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