Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.19: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Confined metallic thin films obtained by epitaxy on Si nanorods — •Lisa Kühnemund, Christoph Tegenkamp, and Herbert Pfnür — Institut für Festkörperphysik, Leibniz Universität Hannover

Understanding the properties of structures on the nanoscale is the key to realize miniaturization in electronic systems. Transport and local spectroscopy of thin but spatially extended Ag layers performed so far have revealed that indeed the morphology in metallic films is essential for (mesoscopic) transport [1,2]. We are interested in the effect of confining these films to structures on the nanoscale. This enables us to control also the current paths and monitor the effective defect structures.

To obtain these structures we used Si nanorods as masks for growing constricted nano-sized Ag films. The Si nanorods of 1 µ m in length and 100 nm in diameter [3] were transferred, after an HF-dip, onto Si substrates. The deposition of Ag at low temperatures reveals metallic and contiguous films of a few atomic layer thickness. First results of this technique as well as local transport measurements obtained by means of a 4 point probe STM-SEM system will be presented.

[1] M. Henzler et al., Phys. Rev. B 58, 10046 (1998).

[2] J. Schmeidel et al., Phys. Rev. B 80, 115304 (2009).

[3] The Si rods were grown by phase shift lithography and plasma etching at the IMTEK, Freiburg.