Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 34: Methods: Scanning probe techniques IV

O 34.2: Talk

Tuesday, March 23, 2010, 15:15–15:30, H32

Design of a combined Scanning Tunneling / Atomic Force Microscope working at low temperatures — •Matthias Emmrich, Anja Merkel, and Franz J. Giessibl — University of Regensburg, Faculty of Experimental and Applied Physics, Universitätsstrasse 31, D-93053 Regensburg, Germany

It is well-known that Scanning Probe Microscopes (SPMs) can yield atomic resolution of surfaces in real space. Custom-built low-noise SPMs can push this envelope and yield chemical information [Sugimoto et al, Nature (2007)], sub atomic resolution [Hembacher et al, Science (2004)], spin contrast [Kaiser et al, Nature (2007)] and submolecular resolution [Gross et al, Science (2009)]. While many commercial microscopes are available, home-built microscopes do not need to sacrifice signal to noise ratio (SNR) in order to accommodate a wide variety of users.

Our goal is a microscope with a vibrational noise level well below 1 pm when operating at liquid He temperatures. Low temperatures reduce thermal motion and increase SNR. More importantly, however, is a stable tip-sample junction.

The current status and preliminary results of this new instrument will be presented.