Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 57: Posters Magnetism II
MA 57.9: Poster
Thursday, March 19, 2020, 15:00–18:00, P3
Towards spin-polarized scanning tunneling spectroscopy of exfoliated 2D magnets — •Benjamin Pestka1, Jeff Strasdas1, Matthew Hamer2, Astrid Weston2, Adam Budniak3, Efrat Lifshitz3, Yaron Amouyal3, Roman Gorbachev2, and Markus Morgenstern1 — 1II. Institute of Physics B, RWTH Aachen University, Germany — 2School of Physics and Astronomy, University of Manchester, UK — 3Schulich Faculty of Chemistry, Department of Materials Engineering, Technion, Haifa 3200003, Israel
Magnetic properties of 2D van der Waals materials are of particular interest for studying magnetic nanoscale interactions. Among others, one has identified the 2D ferromagnets (FM) CrI3 and CrBr3 as well as the anti-ferromagnets (AFM) CrPS4 and MnPS3. Different magnetic couplings between layers due to stacking order have been found and switching by electric field between FM and AFM layer coupling has been demonstrated. Our study focuses on scanning tunneling microscopy (STM) of the FM semiconductor CrBr3 at 6 K and the exfoliation and transfer process of the AFM semiconductor CrPS4 as preparation for future STM investigations. For CrBr3 flakes exfoliated on HOPG in Ar-atmosphere followed by ultra-high-vacuum transfer to the STM, we show atomically resolved STM topography and spectroscopy measurements showcasing the band gap of CrBr3. First spin-polarized measurements with a Cr tip in varying magnetic fields are presented. For CrPS4, we employed different exfoliation processes on SiO2, HOPG and h-BN that led to thicknesses down to 4 layers as measured by atomic force microscopy and Raman spectroscopy.