Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 33: Nanostructures at Surfaces: Metals, Oxides and Semiconductors I

O 33.4: Vortrag

Dienstag, 21. März 2017, 11:15–11:30, REC/PHY C213

Examining small iron clusters by AFM with CO terminated tips — •Sonia Matencio, Ferdinand Huber, Julian Berwanger, Matthias Emmrich, Alfred J. Weymouth, and Franz J. Giessibl — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg, Germany

Physical properties of metal clusters depend on size and structure. With scanning tunneling microscopy (STM), it is difficult to resolve the adsorption site and number of atoms of a cluster. We use atomic force microscopy (AFM) at low temperature and with a CO terminated tip to study clusters of iron on Cu(111). This technique previously revealed single iron atoms as torii with subatomic features and small clusters (<5 atoms) as connected structures [1]. In this work, we study larger single-layer clusters (10 atoms) and two-layer clusters. Between some atoms of the cluster a repulsive feature is observed. This feature can be laterally manipulated by the tip and provides information about the vertical relaxation of iron atoms [2].

[1] M. Emmrich et al., Science 348, 308 (2015).

[2] S. Polesya, S. Mankovsky and H. Ebert. Unpublished.