Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 6: Surface magnetism and magnetic coupling phenomena (joint session MA/O/TT)

TT 6.4: Talk

Monday, April 1, 2019, 10:15–10:30, H53

Investigation of the structural and magnetic properties of self-organized MnO₂ chains on Pt(001) — •Chong-Heeon Park, Martin Schmitt, Matthias Vogt, and Matthias Bode — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, Würzburg, Germany

Recently, the self organized growth of 3d transition metal oxide (TMO) chains on Ir(001) and Pt(001) was investigated by STM, LEED, and DFT calculations [1,2]. Along with the structural (3×1) phase of the MnO₂ chains, antiferromagnetic (AFM) coupling on Ir(001) was predicted along and between adjacent chains. In this study, we investigate the structural and magnetic properties of self-organized MnO₂ chains, grown on Pt(001), with low temperature spin-polarized scanning tunneling microscopy (SP-STM). Similar to Ir(001), we observe a perfectly ordered (3×1) structural phase with an inter-chain periodicity of 3a_Pt. When these chains are scanned with either an in-plane or out-of-plane polarized tip (Cr-coated W tip), we observe a spin structure that can be modeled by a (15×2) magnetic unit cell. It is formed by AFM coupling along the MnO₂ chains and 72^∘ spin spiraling across the chains.

[1] P. Ferstl, et. al., Phys. Rev. B. 96, 085407 (2017)
[2] P. Ferstl, et. al., Phys. Rev. Lett. 120, 089901 (2018)