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Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 31: Poster Session - Metal substrates: Structure, Epitaxy and Growth

O 31.7: Poster

Montag, 16. März 2020, 18:15–20:00, P1C

Scanning tunneling microscopy study of submonolayer growth of MnxAu1−x on Cu(001) — •Ismet Gelen1, Tauqir Shinwari1, Yasser A. Shokr1,2, Evangelos Golias1, and Wolfgang Kuch11Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Faculty of Science, Department of Physics, Helwan University, 17119 Cairo, Egypt

MnxAu1−x exhibits many antiferromagnetic (AFM) phases. Mn2Au is one of them that has a high Néel temperature (≈ 1600 K) and, due to its noncentrosymmetric spin structure and metallic nature, is an interesting AFM material for spintronic applications. Here, we study the growth of MnxAu1−x in the submonolayer (sub-ML) regime on Cu(001) by medium- and low-energy electron diffraction (MEED, LEED), Auger electron spectroscopy (AES), and scanning tunneling microscopy (STM). Different Mn concentrations (x ≈ 0.7−0.9) and different thicknesses (≈ 0.2 − 1.1 ML) were studied, as monitored by AES. Mn and Au were coevaporated by electron bombardment on Cu(001) at room temperature (RT). The growth of thicker films showed MEED intensity oscillations up to around 9 ML. The LEED images display substrate patterns for thicknesses < 0.5 ML, while they display a c(2 × 2) structure for thicker sub-ML films. We observe MnxAu1−x islands on Cu(001) for all sub-ML films with island sizes between ≈ 5 × 5 and 30 × 30 nm2.

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