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O: Fachverband Oberflächenphysik
O 64: Surface Magnetism
O 64.5: Vortrag
Mittwoch, 11. März 2026, 16:15–16:30, HSZ/0403
Layer-dependent magnetic and electronic properties of 2D vdW magnet FeCl2 on Bi(111) — •Shigemi Terakawa1, Jianqiang Liu1, Hikaru Ishikawa1, Ryota Inoue1, Isamu Yamamoto2, Amilcar Bedoya-Pinto3, Niels B. M. Schröter4, and Kazuyuki Sakamoto1 — 1Department of Applied Physics, The University of Osaka, Osaka, Japan — 2Synchrotron Light Application Center, Saga University, Saga, Japan — 3Institute of Molecular Science, University of Valencia, Paterna, Spain — 4Max Planck Institute of Microstructure Physics, Halle, Germany
Two-dimensional (2D) van der Waals (vdW) magnets are promising for future spintronic applications. Recently, transition metal dihalides (TMDHs) have received increasing attention as a new class of 2D vdW magnets. In this study, we report the layer dependence of the magnetic and electronic properties of ultrathin FeCl2, a layered antiferromagnetic insulator, films on Bi(111) from monolayer to four layers. X-ray magnetic circular dichroism (XMCD) measurements revealed that the monolayer film exhibits an in-plane easy axis, while the thicker films have an out-of-plane easy axis with a spin-flip transition, which is consistent with the antiferromagnetic order of bulk FeCl2. The transition field increases with increasing thickness. Angle-resolved photoelectron spectroscopy (ARPES) revealed insulating electronic structure irrespective of the thickness. Layer-dependent change is found as the increase in the width of the bands with large Cl 3p contributions. These results show that both the magnetic and electronic coupling through the vdW interfaces become stronger as the thickness increases.
Keywords: vdW material; XMCD; ARPES; 2D magnet