Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 10: Nanostructures at Surfaces I
O 10.6: Talk
Monday, March 11, 2013, 11:45–12:00, H45
Decoration of Co island edges on Cu(111) by Fe — •Jeison A. Fischer1, 2, Soo-hyon Phark1, Marco Corbetta1, Dirk Sander1, and Jürgen Kirschner1, 3 — 1Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 2LFFS, Universidade Federal de Santa Catarina , Florianópolis, SC, Brazil — 3Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
We performed low temperature scanning tunneling spectroscopy (LT-STS) measurements on almost triangular bilayer Co islands on Cu(111), which were decorated along the rim by a nm wide Fe stripe. The sample was prepared by subsequent deposition of Co[1] and Fe at 300 K. We obtained energy resolved differential conductance maps for islands with different lateral size. We find that Fe decoration induces a vanishing of the well-established electronic rim state of Co [1, 2]. The Fe-decorated islands show a pronounced spatial modulation of the dif-ferential conductance within the Co core, which we ascribe to electron confinement. A quan-titative analysis [3] identifies the characteristic length of confinement. It corresponds exactly to the geometrical height of the triangular Co core, as derived from constant current topogra-phy STM images. The comparison between characteristic lengths of Fe-decorated-Co islands and pure Co islands establishes the electronic rim state as the relevant boundary for electron confinement of the latter. This leads to a smaller characteristic length for confinement in pure Co as compared to Fe-decorated islands. [1] Pietzsch et al. Phys. Rev. Lett. 96, 237203 (2006). [2] Oka et al. Science 327, 843 (2010) [3] Rodary et al. Phys. Rev. B 75, 233412 (2007)