Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.77: Poster
Tuesday, March 15, 2011, 18:30–22:00, P4
Production and electrical properties of nano and micro structures on graphite surfaces — •Lukas Patryarcha1, Karl Bauer1, Sven Bauerdick2, Lars Bruchhaus2, and Heinz Hövel1 — 1TU Dortmund, Experimentelle Physik I — 2Raith GmbH, Dortmund
Nano structures on HOPG surfaces were produced by using focused Ga+ ion beams (FIB, 10nm beam width). Nano structures were produced either using high doses by a direct milling process with a structure depth up to 300nm or after a low dose exposure by an additional oxidation process with Ar/O2 (2% O2) at 770K for 3h where the structure depth abruptly increases at a critical ion dose of 15-20µAs/cm2 to values between 50-70nm dependent on the acceleration voltage. Structuring on thin ( 0.1µm) but large ( 2.5mm2) HOPG films on an insulating mica slice create structures without electrical contact to the rest of the HOPG sample. The purpose of the project is to control the production process of these structures and to measure their physical properties using AFM and four-point measurements for nano and micro scaled structures.