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

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 Cr${}_2$Ge${}_2$Te${}_6$ (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.

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Cited by in corpus (9)

• Spin Dynamics in van der Waals Magnetic Systems
• Magnetic Switching in Monolayer 2D Diluted Magnetic Semiconductors via Spin-to- Spin Conversion
• Fundamentals and applications of Van der Waals magnets in magnon spintronics
• Electron Spin Resonance Spectroscopy on Magnetic Van der Waals Compounds
• Linear response theory for cavity QED materials at arbitrary light-matter coupling strengths
• Enhanced Magnetization by Defect-Assisted Exciton Recombination in Atomically Thin CrCl${}_3$
• Enhancement of Microwave to Optical Spin-Based Quantum Transduction via a Magnon Mode
• Waveguide quantum electrodynamics at the onset of spin-spin correlations
• Ultrafast magnetic moment transfer and bandgap renormalization in monolayer FeCl${}_2$