Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 35: Poster Session I (Scanning probe methods)
O 35.6: Poster
Dienstag, 15. März 2011, 18:30–22:00, P3
Combined scanning tunneling and atomic force microscopy at low temperatures — •Tobias Herden1, Markus Ternes1, and Klaus Kern1,2 — 1Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany — 2Institut de Physique des Nanostructures, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzwerland
Quartz tuning forks have an interesting history in the evolution of scanning probe microscopy. Edwards et al. [1] were the first to use them with a tip glued to one prong as AFM sensor. In 1998 Giessibl [2] introduced a technique (qPlus) where the tuning fork is excited externally and a conducting tip is used allowing for simultaneous AFM and STM measurements. The capabilities of this design have been demonstrated by a broad variety of measurements: from quantitative forces measurements when an atom or molecule is moved over a surface [3] to sub-molecular resolution of pentacene by Gross et al. [4].
This type of sensor was implemented in a newly built STM head. It is designed to operate in UHV in a Joule-Thomson cryostat, at temperatures below 1 Kelvin and in magnetic fields up to 14 Tesla. The head was extensively tested at ambient conditions and in moderate vacuum and first measurements at low temperatures will be presented. The focus will be on the design, especially the mounting and contacting of the tuning fork.
[1] H. Edwards et. al, J. Appl. Phys. 82, 980 (1997) - [2] F. J. Giessibl, Appl. Phys. Lett. 73, 3956 (1998) - [3] M. Ternes et.al, Science 319, 1066 (2008) - [4] L. Gross et. al, Science 325, 1110 (2009)