Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 87: Metal Substrates: Structure, Epitaxy and Growth

O 87.2: Vortrag

Donnerstag, 23. März 2017, 11:00–11:15, WIL C307

Growth and Magnetism of Fe Thin Films on Rh(111) — •Matthias Vogt, Nicolai Seubert, Martin Schmitt, Jeannette Kemmer, and Matthias Bode — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

We present a growth study of monolayer and bilayer Fe films on Rh(111) monitored by scanning tunneling microscopy. The arrangement of the Fe layers on the surface can be influenced to a certain extent by varying the post-annealing temperature, but Fe tends to form high islands with small terrace size under these conditions. Large flat Fe terraces were only observed when the sample was heated during evaporation. Whereas the first layer seems to grow pseudomorphic, the second layer exhibits zig-zag–shaped arrays, which seem to be suppressed in areas with high defect densities. They share many aspects with the Fe double-layer on Ir(111) reported previously [1] and resemble a periodic herringbone pattern. For the Fe double-layer on Rh(111) the periodicities amount to about 1.58 nm between the ribs and about 14.5 nm from backbone to backbone. The results of measurements performed with magnetically coated probe tips will be presented and discussed to identify the underlying Fe spin structure.

[1] P.-J. Hsu et al., Phys. Rev. Lett. 116, 017201 (2016).