A beetle-type, variable-temperature scanning tunneling microscope for video-rate imaging

Henss, A.-K.; Wiechers, J.; Schuster, R.; Platschkowski, V. und Wintterlin, J. (2020): A beetle-type, variable-temperature scanning tunneling microscope for video-rate imaging. In: Japanese Journal of Applied Physics, Bd. 59, SN1007

Abstract

A setup is described that combines video-rate imaging with temperature variability for a beetle-type scanning tunneling microscope (STM). The STM is operated in the constant height mode. Sinusoidal driving voltages are used for the scan lines;the resulting image distortions are corrected by a straightforward mathematical operation. A phase shifter is used to compensate the time lag between the driving voltage and the tip motion. A preamplifier with a bandwidth of 300 kHz and an rms noise of similar to 0.1 nA has been developed. Software has been written for data acquisition rates of up to 2 MHz and for saving movies of more than 3700 STM images of 200 x 200 pixels. Frame rates between 10 and 50 frames s(-1) have been achieved, where the highest line rates are above the lowest resonance frequency of the STM. The accessible temperature range of 50-500 K is not impaired by the video mode. (C) 2020 The Japan Society of Applied Physics

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 0021-4922
• Sprache: Englisch