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Probing spin dynamics of ultra-thin van der Waals magnets via photon-magnon coupling

Author

Listed:
  • Christoph W. Zollitsch

    (University College London)

  • Safe Khan

    (University College London)

  • Vu Thanh Trung Nam

    (National University of Singapore)

  • Ivan A. Verzhbitskiy

    (National University of Singapore)

  • Dimitrios Sagkovits

    (University College London
    National Physical Laboratory)

  • James O’Sullivan

    (University College London)

  • Oscar W. Kennedy

    (University College London)

  • Mara Strungaru

    (The University of Edinburgh)

  • Elton J. G. Santos

    (The University of Edinburgh
    The University of Edinburgh)

  • John J. L. Morton

    (University College London
    UCL)

  • Goki Eda

    (National University of Singapore
    National University of Singapore
    National University of Singapore)

  • Hidekazu Kurebayashi

    (University College London
    UCL
    Tohoku University)

Abstract

Layered van der Waals (vdW) magnets can maintain a magnetic order even down to the single-layer regime and hold promise for integrated spintronic devices. While the magnetic ground state of vdW magnets was extensively studied, key parameters of spin dynamics, like the Gilbert damping, crucial for designing ultra-fast spintronic devices, remains largely unexplored. Despite recent studies by optical excitation and detection, achieving spin wave control with microwaves is highly desirable, as modern integrated information technologies predominantly are operated with these. The intrinsically small numbers of spins, however, poses a major challenge to this. Here, we present a hybrid approach to detect spin dynamics mediated by photon-magnon coupling between high-Q superconducting resonators and ultra-thin flakes of Cr2Ge2Te6 (CGT) as thin as 11 nm. We test and benchmark our technique with 23 individual CGT flakes and extract an upper limit for the Gilbert damping parameter. These results are crucial in designing on-chip integrated circuits using vdW magnets and offer prospects for probing spin dynamics of monolayer vdW magnets.

Suggested Citation

  • Christoph W. Zollitsch & Safe Khan & Vu Thanh Trung Nam & Ivan A. Verzhbitskiy & Dimitrios Sagkovits & James O’Sullivan & Oscar W. Kennedy & Mara Strungaru & Elton J. G. Santos & John J. L. Morton & G, 2023. "Probing spin dynamics of ultra-thin van der Waals magnets via photon-magnon coupling," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38322-x
    DOI: 10.1038/s41467-023-38322-x
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    1. Freddie Hendriks & Rafael R. Rojas-Lopez & Bert Koopmans & Marcos H. D. Guimarães, 2024. "Electric control of optically-induced magnetization dynamics in a van der Waals ferromagnetic semiconductor," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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