Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 27: Nanostructures: Low Dimensions

O 27.5: Talk

Tuesday, March 17, 2015, 15:00–15:15, MA 005

PtFe and IrFe atomic bilayers on Ir(111) investigated by STM — •Maximilian Meyer, André Kubetzka, Kirsten von Bergmann, and Roland Wiesendanger — Department of Physics, University of Hamburg, Germany

Non-magnetic capping layers are a means to passivate chemically reactive magnetic films and they also allow to tailor specific magnetic properties by modifying the interface [1,2].

Here we use scanning tunneling microscopy (STM) to investigate the growth of Pt and Ir on an atomic layer of Fe on Ir(111) which exhibits an atomic-scale magnetic skyrmion lattice [3].

We will discuss differences and similarities of these two systems and show the influence of the substrate temperature onto the film growth.

In the low coverage regime we observe atomic layer islands of both fcc and hcp stacking and for Pt we find a tendency for 2nd atomic layer nucleation on Fe/Ir(111). For Pt/Fe/Ir(111) the smoothest films were achieved at intermediate temperatures where the atom mobility is increased and alloying has not yet set in.

[1] N. Romming et al., Science 341, 636 (2013)

[2] B. Dupé et al., Nature Comm. 5, 4030 (2014)

[3] S. Heinze et al., Nature Physics 7, 713 (2011)