Slow-Wave Hybrid Magnonics

Jing Xu, Changchun Zhong, Shihao Zhuang, Chen Qian, Yu Jiang, Amin Pishehvar, Xu Han, Dafei Jin, Josep M. Jornet, Bo Zhen, Jiamian Hu, Liang Jiang, and Xufeng Zhang

Phys. Rev. Lett. 132, 116701 – Published 12 March 2024

Abstract

Cavity magnonics is an emerging research area focusing on the coupling between magnons and photons. Despite its great potential for coherent information processing, it has been long restricted by the narrow interaction bandwidth. In this Letter, we theoretically propose and experimentally demonstrate a novel approach to achieve broadband photon-magnon coupling by adopting slow waves on engineered microwave waveguides. To the best of our knowledge, this is the first time that slow wave is combined with hybrid magnonics. Its unique properties promise great potentials for both fundamental research and practical applications, for instance, by deepening our understanding of the light-matter interaction in the slow wave regime and providing high-efficiency spin wave transducers. The device concept can be extended to other systems such as optomagnonics and magnomechanics, opening up new directions for hybrid magnonics.

Received 18 May 2023
Revised 14 December 2023
Accepted 8 February 2024

DOI:https://doi.org/10.1103/PhysRevLett.132.116701

Physics Subject Headings (PhySH)

Magnons Spin waves Surface plasmon polariton Waveguides

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jing Xu¹, Changchun Zhong ², Shihao Zhuang³, Chen Qian⁴, Yu Jiang⁵, Amin Pishehvar⁵, Xu Han¹, Dafei Jin^6,1, Josep M. Jornet ⁵, Bo Zhen⁴, Jiamian Hu³, Liang Jiang ², and Xufeng Zhang ^5,7,*

¹Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
²Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA
³Department of Materials Science and Engineering, University of Wisconsin—Madison, Madison, Wisconsin 53706, USA
⁴Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
⁵Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115, USA
⁶Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556, USA
⁷Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA

^*xu.zhang@northeastern.edu

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Issue

Vol. 132, Iss. 11 — 15 March 2024

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Images

Figure 1
(a) Schematics of the hybrid SSPP-magnonic device (not to scale). A planar magnonic resonator is placed on a periodically corrugated microstrip. Inset: simulated mode profile (total magnetic field $h$ ) of SSPPs. (b) Dispersions and (c) group velocities obtained from COMSOL simulation for SSPPs on a waveguide with $w = t = 100 μ m$ , $l = 3 mm$ , and varying period $d$ . Dotted lines: dispersions of the same uncorrugated microstrip, plotted against $β$ values that are normalized using different $d$ values. $f_{p}$ : effective plasma frequency of SSPPs. (d) Phase-field simulation results for the temporal evolution of the precessing field $m_{x}$ of the magnon modes in two neighboring magnonic resonators (in phase at $f = 0.98 f_{p}$ ; $π$ out of phase at $f \approx f_{p}$ ).
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Figure 2
(a) Optical image of the fabricated SSPP waveguide circuit. Between the SSPP waveguide and the SMA connectors there exists a tapered transition region where the corrugation depth $l$ is quadratically varied. (b) Enlarged image showing a YIG resonator ( $400 μ m \times 400 μ m$ ) flipped on the SSPP waveguide. (c) Measured transmission spectra for SSPP waveguide, CPW, and microstrip, respectively. Background spectra are removed to highlight the weak magnon resonances. Insets: the measured spectra corresponding to the points indicated by the arrows, respectively.
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Figure 3
(a) Measured transmission spectra of the SSPP waveguide with the magnet at different positions $z$ . Black arrows indicate the magnon resonances. (b) Extracted extinction ratio of the magnon resonances as a function of the magnon frequency. (c) Extracted (red circles) and calculated (solid line) SSPP-magnon coupling strength $g_{ms}$ as a function of magnon frequency. Blue squares: extracted intrinsic magnon damping rate $κ_{m} / 2$ .
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Figure 4
(a) Measured transmission spectra of a SSPP waveguide covered by $5 mm \times 5 mm \times 3 μ m$ rectangular YIG resonator. (b) The measured SSPP waveguide transmission at magnet position $z = 1.0$ (black) and $z = 3.8 mm$ (red), respectively. (c) Extracted group delay $τ$ from the measured transmission phase. The large oscillations above the cutoff frequency are due to standing waves. (d) The measured transmission spectra using a $350 − μ m$ -thick, 5-mm-diameter YIG disc. Trans.: transmission. All dashed and dotted lines in (a) and (d) are from calculation and use the $y$ axis on the right. Blue line: calculated magnon mode; red and yellow lines: calculated $f_{p}$ with and without SSPP-magnon coupling, respectively. $f_{m}$ is the magnon frequency.
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