Regensburg 2022 – wissenschaftliches Programm
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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.