Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 110: Surface Magnetism
O 110.3: Vortrag
Freitag, 22. März 2024, 11:00–11:15, MA 144
Moiré-induced interface electronic states and magnetic properties of monolayer FeCl2 on Bi(111) — •Shigemi Terakawa, Jingrong Ji, Gabriele Domaine, Emily C. McFarlane, Stuart S. P. Parkin, and Niels B. M. Schröter — Max Planck Institute of Microstructure Physics, Halle, Germany
Two-dimensional van der Waals (vdW) magnets have attracted increasing attention because of their potential use in magnetic vdW heterostructures, leading to various novel quantum phases through their unique properties such as the magnetic proximity effect and the moiré superlattice. FeCl2 is a layered antiferromagnet, where the magnetic moments aligned in the out-of-plane direction are coupled ferromagnetically in a unit layer and antiferromagnetically between adjacent layers. We have successfully grown monolayer FeCl2 film on Bi(111) using molecular beam epitaxy. The high crystallinity of the film was confirmed by low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM). LEED and STM show strong moiré patterns. Angle-resolved photoelectron spectroscopy (ARPES) revealed the insulating band structure of monolayer FeCl2. We found metallic X-shaped crossing bands at the K points of the moiré Brillouin zone (BZ). The bands can be understood as the interface states originating from the Bi(111) surface states, which are modified by hole doping and back-folding according to the moiré BZ. The magnetic hysteresis curves of monolayer FeCl2 measured by X-ray magnetic circular dichroism (XMCD) show a higher slope at zero field for in-plane configuration, suggesting a magnetic order with an in-plane easy axis.
Keywords: ARPES; XMCD; 2D material; heterostructure