Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Poster Tuesday: Nanostructures

O 41.8: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

STM investigations on CoO₂ chains on Pt(001) — •Paula M. Weber, Chong-Heeon Park, Martin Schmitt, Matthias Vogt, and Matthias Bode — Physikalisches Institut, Lehrstuhl für Experimentelle Physik II, Universität Würzburg, Deutschland

Recently, the structural and magnetic properties of transition metal oxides (TMO) on heavy fcc(001) surfaces, such as Ir(001) or Pt(001), have attracted considerable interest [1,2]. Here, we present a spin-polarized STM investigation of CoO₂ on Pt(001). Whereas a ferromagnetic coupling along the chains was predicted for CoO₂/Ir(001) [1], it has been proposed that the CoO₂ on Pt(001)-system has an antiferromagnetic ground state [2].

Topographic STM data confirm a perfectly ordered (3×1) structural phase with a periodicity of 3a_Pt between the TMO chains. Spin-resolved data were acquired by scanning with out-of-plane or in-plane polarized Cr- or Fe-coated W-tips respectively, whereby the sensitivity of each tip was characterized by test measurements on the Fe-layer on W(110). In contrast to expectations, we did not find any magnetic contrast in our SP-STM data of CoO₂/Pt(001).

We will discuss the implications of the observed structural contrasts and how the surface changes upon adsorption of residual gas from the vacuum system.

[1] P. Ferstl, et al., Phys. Rev. Lett. 117, 046101 (2016)

[2] P. Ferstl, et al., Phys. Rev. B 96, 085407 (2017)