Abstract
The experimental determination of the main parameters of the feedback system in a scanning tunnelling microscope (STM) is discussed. Knowledge of these parameters allows one to determine accurately the region where unstable STM operation could affect measurements, and also to set the optimal working conditions to obtain high-quality images. Each parameter involved in the feedback circuitry is analysed and discussed as are their mutual interactions. Different working conditions are simulated and analysed in order to determine the parameters needed for stable operation.
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