Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster: Metal Substrates - Structure, Epitaxy, Growth and Adsorption
O 41.4: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
Investigation of Fe/W(110) system with Field Emission Scanning Probe Microscopy — •Robin Pröbsting1, Gabriele Bertolini1, Danilo Andrea Zanin1, Hugo Cabrera1, Urs Ramsperger1, Danilo Pescia1, and Oguzhan Gürlü1,2 — 1Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland — 2Istanbul Technical University, Department of Physics, 34469 Istanbul, Turkey
We studied the structural and electronic properties of atomic layer iron films on clean and carbide covered W(110) crystal surfaces. Surface structures were studied first by scanning tunnelling microscopy (STM). By means of retracting the tip several nanometres from the sample and increasing the tip bias with respect to the sample, we are able to measure field emitted current both on the tip and on the sample side of the junction. Also, secondary electrons (SE) generated on the sample were collected with a channeltron. Secondary electron maps of the surfaces acquired simultaneously with the absorbed current maps revealed that the local electronic nature of the iron-tungsten system is much richer than the STM shows. The nanometre lateral resolution attained in SE maps and the measurement of the image potential states on different surface locations presents the Topografiner as a potential candidate for atomic level spectroscopy on surfaces.