Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 26: Surface Magnetism

O 26.9: Talk

Tuesday, September 6, 2022, 12:30–12:45, H4

A spin-polarized STM investigation of 3 AL Mn films on W(001) — •Paula M. Weber, Jing Qi, and Matthias Bode — Physikalisches Institut, Experimentelle Physik II, Julius-Maximilians-Universität Würzburg, Germany

Spin spirals and dead magnetic layers in the antiferromagnetic transition metal Mn on the heavy bcc(001) surface of W have recently attracted considerable interest [1,2]. In this talk, we present a spin-polarized STM investigation of 2-4 atomic layer (AL) thick Mn films on W(001). For 3 AL Mn on W(001) it has been theoretically proposed that this system grows pseudomorphically while exhibiting an antiferromagnetic state [3]. Our topographic STM data confirm that pseudomorphic growth even prevails up to a Mn film thickness of 4 AL. Spin-resolved data were acquired with W tips which had been magnetized on Mn layers by in-situ treatment on Mn/W(001). This allowed us to collect topographic and spin-resolved data on the same scanning area. Applying this method, we identify a magnetic zig-zag 2√ 2 × √ 2 structure on 3 AL Mn and a strongly bias-dependent labyrinth overlay structure on 4 AL. Potential spin structures will be discussed.
[1] Ferriani et al., Phys. Rev. Letters 101, 027201 (2008).
[2] Meyer et al., Phys. Rev. Research 2, 012075 (2020).
[3] Dennler et al., Phys. Rev. B 72, 214413 (2005).