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

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, Goki Eda and Hidekazu Kurebayashi
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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
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
John J. L. Morton: University College London
Goki Eda: National University of Singapore
Hidekazu Kurebayashi: University College London

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-38322-x

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