Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)

O 58.52: Poster

Mittwoch, 13. März 2013, 18:15–21:45, Poster B1

Investigation of single Co atoms on Mn/W(001) — •Arne Köhler, Alexander Schwarz, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Germany

Recently, the magnetic coupling between single Co atoms and the antiferromagnetic spin-spiral of Mn/W(110) has been studied with Scanning Tunneling Microscopy [1]. Using the ferromagnetic spin-spiral of Mn/W(001) [2] as a further complex magnetic template for Co atoms, our final goal is to investigate local magnetic properties of Co adatoms using Magnetic Exchange Force Microscopy [3] and Spectroscopy [4].

To inhibit aggregation of Co atoms on the substrate, they are deposited and investigated at low temperature. In our particular set-up, Co atoms are deposited from a miniature evaporator inserted into the cantilever holder. After deposition, different atomic scale contrast features are found on the substrate, indicating several adsorbed species. The origin of these adsorbates can be twofold: coadsorption during Co evaporation, i.e., CO, or formation on the surface after deposition, i.e., H:Co complexes. The latter is of particular interest, as it can be expected that H:Co behave magnetically different than single Co atoms.

Therefore, it is necessary to differentiate between Co atoms and other species on the surface.

[1] D. Serrate et al., Nat. Nanotech. 5, 350 (2010).

[2] P. Ferriani et al., Phys. Rev. Lett. 101, 027201 (2008).

[3] U. Kaiser et al., Nature 446, 522 (2007).

[4] R. Schmidt et al., Phys. Rev. Lett. 106, 257202 (2011).