Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 110: Surface Magnetism

O 110.8: Vortrag

Freitag, 22. März 2024, 12:15–12:30, MA 144

Tip-assisted motion of Co and Rh atoms on the antiferromagnet Mn/Re(0001) — •Felix Zahner, Kirsten von Bergmann, Roland Wiesendanger, and André Kubetzka — Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg

The diffusion of adatoms on surfaces is a fundamental process, governing the growth and self-assembly of thin films and nanostructures. Adatom diffusion on non-magnetic surfaces has been investigated in real-space by local probes such as field ion microscopy [1] and scanning tunneling microscopy (STM) [2], whereas diffusion on magnetic surfaces has so far only been addressed theoretically [3].

In this contribution, we have studied Co and Rh atoms on a single fcc-stacked layer of Mn on Re(0001). The ground state of this hexagonal layer is a row-wise antiferromagnetic state [4], which reduces the symmetry and results in a uniaxial system. We use the tip of an STM at T = 4.2 K to induce adatom motion and investigate to what extent the magnetic state influences the movement of magnetic Co atoms and non-magnetic Rh atoms.
[1] G. Antczak, G. Ehrlich, Surface Science Reports 62, 39 (2007).

[2] J. Li, R. Berndt, W.-D. Schneider, Phys.Rev.Lett. 76, 1889(1996).

[3] S. Dennler, J. Hafner, Phys. Rev B 72, 214414 (2005).

[4] J. Spethmann, S. Meyer, K. von Bergmann, R. Wiesendanger, S. Heinze, A. Kubetzka, Phys. Rev. Lett. 124, 227203 (2020).

Keywords: diffusion; STM; single atoms; antiferromagnetism