Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Poster Session II - MA 141/144 (Surface Spectroscopy on Kondo Systems; Frontiers of Surface Sensitive Electron Microscopy; Methods: Scanning Probe Techniques+Electronic Structure Theory+Other; Time-Resolved Spectroscopy of Surface Dynamics with EUV and XUV Radiation; joined by SYNF posters)
O 43.11: Poster
Dienstag, 26. Februar 2008, 18:30–19:30, Poster F
Design of an UHV-STM for applications at low temperatures and high magnetic fields — Daniel Haude1, •Matthias Menzel1, Kirsten von Bergmann1, Matthias Bode2, and Roland Wiesendanger1 — 1Institute of Applied Physics, University of Hamburg, Germany — 2Center for Nanoscale Materials, Argonne National Laboratory, USA
We constructed a Scanning Tunneling Microscope (STM) for spin-polarized studies of magnetic adatoms on metallic surfaces. This STM is mounted in a commercial 3He-Flow-Cryostat, which allows measurements in UHV conditions and at a magnetic field up to 9 T perpendicular to the sample. With 4He in the gas loop we already reached a temperature of 1.16 K leading to an estimation of a temperature of 700 mK with 3He in the cycle. Since the STM is fixed at the bottom of the cryostat insert, tip and sample are transferred without visibility using a magnetic drive for linear and rotary motions. The cryostat is mounted via a transfer chamber to an existing UHV system which has been described elsewhere [1].
Tips and samples can be transferred throughout the pre-existing UHV system thus allowing us to investigate the same samples with different STM’s. With an electron beam evaporator we can deposit different magnetic materials onto the cold substrate enabling studies of magnetic properties of single atoms or clusters of few atoms.
[1] O. Pietzsch et al., Rev. Sci. Instrum. 71, 424 (2000)