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Multi-tip STM with the Koala drive

The compactness of the Koala drive offers the possibility to design a multi-tip STM in which four independent STM units are integrated within a diameter of 50 mm.


4-tip STM as compact as a single-tip STM




  • The compactness of the Koala drive offers the possibility to build a multi-tip STM where four independent STM units are integrated within a diameter of 50 mm
  • Lowest resonance frequencies are 2.5 kHz (xy) and 5.5 kHz (z)











Optical microscope movie of four tips probing a wafer

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Positioning of the tips on a structured wafer and the sample positioning is performed using an optical microscope

  • Each tip and the sample can be positioned independently
  • Fine-positioning is done using STM/AFM
  • Highest mechanical stability due to smallest size




UHV 4-tip STM with the Koala drive




  • Compact “beetle” design: several STM’s stacked into each other
  • SEM for coarse positioning of the tips
  • Tip-tip distance only limited by the tip diameter
















Atomic resolution with all tips on Si(7x7): unfiltered original data

Atomic resolution with all tips Si(7x7): unfiltered original data


Scanning force microscopy using the needle sensor


  • In order to perform electric measurements on insulating substrates (e.g. SiO2) a multi-tip scanning force microscope is required. STM does not work on insulators
  • Due to its ultra-small footprint the needle sensor (length 3 mm) provides a simple upgrade from STM to AFM. Only one additional wire is required










Atomic steps on SiO2 imaged with single tip AFM with needle sensorAtomic steps on SiO2 imaged with single tip AFM with needle sensor



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