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Journal Article

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


Platschkowski,  Viktor
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Henß, A.-K., Wiechers, J., Schuster, R., Platschkowski, V., & Wintterlin, J. (2020). A beetle-type, variable temperature scanning tunneling microscope for video-rate imaging. Japanese Journal of Applied Physics, 59: SN1007. doi:10.35848/1347-4065/ab8680.

Cite as: http://hdl.handle.net/21.11116/0000-0006-6CF7-B
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 ~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 × 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.