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O: Fachverband Oberflächenphysik

O 26: Surface Magnetism

O 26.1: Vortrag

Dienstag, 6. September 2022, 10:30–10:45, H4

Investigation of bubble domains in Fe₃GeTe₂ by spin-polarized scanning tunneling microscopy — •Namrata Bansal¹, Hung-Hsiang Yang¹, Philipp Rueßmann², Markus Hoffmann², Lichuan Zhang², Dongwook Go², Amir-Abbas Haghighirad³, Kaushik Sen³, Matthieu Le Tacon³, Yuriy Mokrousov², and Wulf Wulfhekel¹ — 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

We investigated the magnetic structure of the van der Waal material, Fe₃GeTe₂ (FGT), using a home-built low temperature (0.7 K) spin-polarized scanning tunneling microscope (SP-STM). Out-of-plane magnetic imaging with chromium-coated tungsten tip reveals bubble domains in FGT. When applying out-of-plane magnetic fields, the domain shape transitioned from elliptical to circular and collapsed at around 0.32 T. We observed an inverse relation between the size of the bubble domains and the magnetic fields. Benefiting from the spatial resolution of the SP-STM, the domain wall widths were determined, which contains information about the exchange stiffness and the anisotropy constant of FGT.