Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.92: Poster

Dienstag, 1. April 2014, 18:30–22:00, P2

Growth and characterization of ultrasmall cobalt nanoislands on Cu(111) — •David Gohlke and Jascha Repp — Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany

The ability to manipulate the magnetic properties of individual molecules and atoms is greatly affected by the substrate on which they rest. By adding nanoscale ferromagnetic regions to normal metal, one can vary the magnetic landscape for these adsorbates. It has previously been shown that Co adsorbed on the Cu(111) surface can self-assemble into spin-polarized triangular islands with lateral sizes between 5 and 30 nm. Here, we present a modified growth procedure for forming Co islands on this surface. By depositing metal on a cryogenic-temperature copper surface before annealing to room temperature, islands smaller than 5 nm are formed. These Co nanoislands bridge the size regime from the isolated adatom and few-atom clusters to the larger Co islands previously studied. Scanning tunneling microscopy (STM) allows for clear topographic characterization as well as a detailed examination of the electronic states of these islands, showing a continuation of the previously published downward trend in the energy of the highest occupied electronic state with decreasing island size.