Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 54: Poster Wednesday: 2D Materials 2
O 54.7: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Growth and characterization of monolayer MnSe2 on Au(111) — •Sebastien Elie Hadjadj1, Evangelos Golias2, Jack Hayes1, Marcel Walter1, Christian Lotze1, Sangeeta Thakur1, Ivar Kumberg1, Ismet Gelen1, Jorge Torres1, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2MAX IV Laboratory, Lund University, Fotongatan 2, Lund, Sweden
During the last couple of years, there has been a rising interest in novel two-dimensional magnetic materials. Most recently, several groups have shown that magnetic order in two-dimensional materials can be stable. Among them, MnSe2 is interesting, since it has shown magnetic properties at room temperature [1], making it an ideal candidate for applications. However, magnetic order so far has been reported for MnSe2 grown on GaSe or SnSe2, and the role of the interface in the stabilization of magnetic order is not yet clear. We use molecular beam epitaxy to co-deposit Se and Mn on Au(111) to ascertain if the magnetic ordering of monolayer MnSe2 is an intrinsic effect of the material or an interface-induced phenomenon. We examine the films chemically by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS) as well as structurally by scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). The latter shows a near - 3 × 3 pattern. The XPS measurements show chemical shifts in the Mn and Se binding energies for the MnSe2 sample in comparison to pure Mn and Se that confirm that the Mn has bonded to Se. [1] D. J. O’Hara et al., Nano Letters 18, 3125 (2018).