Presentation Information
[3E14]Layer-dependent magnetic and electronic properties of 2D magnet FeCl2 on Bi(111)
*Shigemi Terakawa1, Jianqiang Liu1, Amilcar Bedoya-Pinto2, Niels B. M. Schröter3, Kazuyuki Sakamoto1 (1. Graduate School of Engineering, The University of Osaka, 2. Institute of Molecular Science, University of Valencia, 3. Max Planck Institute of Microstructure Physics)
2D vdW magnets have attracted attention for future spintronic applications. Bulk FeCl2 is a vdW antiferromagnetic insulator with an out-of-plane magnetic anisotropy. Recently, we succeeded in the epitaxial growth of monolayer FeCl2 on Bi(111) and found that it has a predominantly in-plane magnetic anisotropy. In this study, we report the layer dependence of the magnetic and electronic properties of ultrathin FeCl2 films on Bi(111) from monolayer to four layers. ARPES measurements reveal that the FeCl2 films are insulating down to the monolayer and that the valence band top is located at a Fe-3d-derived flat band irrespective of thickness. XMCD measurements demonstrate that the out-of-plane anisotropy and interlayer antiferromagnetic coupling are recovered from two-layer FeCl2. The transition field and temperature increase as the thickness increases. Our results demonstrate the possibility to control the magnetic properties of a 2D vdW magnet by thickness and coupling with a substrate.