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MA: Fachverband Magnetismus

MA 16: Magnonics

MA 16.9: Vortrag

Dienstag, 28. März 2023, 11:45–12:00, HSZ 403

Investigation of magnon-phonon coupling in two dimensional ferromagnetic Fe₃GeTe₂ — •Namrata Bansal¹, Qili Li¹, Paul Nufer¹, Hung-Hsiang Yang¹, Lichaun Zhang², Dongwook Go², Amir-Abbas Haghighirad³, Yuriy Mokrousov^2,4, and Wulf Wulfhekel^1,3 — ¹Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — ²Peter Gruenberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1) Forschungszentrum Juelich GmbH, D-52425 Juelich — ³Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — ⁴Institute of Physics, Johannes Gutenberg-University Mainz, 55099 Mainz, Germany

We use inelastic tunneling spectroscopy (ITS) at 35 mK to investigate phonon-magnon coupling in the ferromagnetic van der Waals crystals Fe3GeTe2 (FGT). ITS is a powerful tool for determining the inelastic scattering of hot carriers with magnons or phonons with the second derivative of the tunneling current with respect to the bias voltage being proportional to the density of states of phonons and/or magnons. We observe excitation peaks at low energy which do not correspond to van Hove singularities of the phonon or magnon density of states but to points in their dispersion, where magnon and phonon bands cross, indicative for phonon-magnon coupling.