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Review of Scientific Instruments / Volume 83 / Issue 2 / ARTICLES / Microscopy and Imaging
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Rev. Sci. Instrum. 83, 023703 (2012); http://dx.doi.org/10.1063/1.3681444 (4 pages)

A nanopositioner for scanning probe microscopy: The KoalaDrive

Vasily Cherepanov, Peter Coenen, and Bert Voigtländer

Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany and JARA-Fundamentals of Future Information Technology

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(Received 5 December 2011; accepted 13 January 2012; published online 7 February 2012)

We present a new type of piezoelectric nanopositioner called KoalaDrive which can have a diameter less than 2.5 mm and a length smaller than 10 mm. The new operating principle provides a smooth travel sequence and avoids shaking which is intrinsic to nanopositioners based on inertial motion with sawtooth driving signals. In scanning probe microscopy, the KoalaDrive can be used for the coarse approach of the tip or sensor towards the sample. Inserting the KoalaDrive in a piezo tube for xyz-scanning integrates a complete scanning tunneling microscope (STM) inside a 4 mm outer diameter piezo tube of <10 mm length. The use of the KoalaDrive makes the scanning probe microscopy design ultracompact and accordingly leads to a high mechanical stability. The drive is UHV, low temperature, and magnetic field compatible. The compactness of the KoalaDrive allows building a multi-tip STM as small as a single tip STM.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. THE KOALADRIVE
  3. THE KOALADRIVE STM
  4. CONCLUSIONS

RELATED DATABASES

Web of Science

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KEYWORDS, PACS, and IPC

Keywords

nanopositioning, scanning tunnelling microscopy

PACS

  • 07.79.Cz

    Scanning tunneling microscopes

  • 06.60.Sx

    Positioning and alignment; manipulating, remote handling

  • 68.37.Ef

    Scanning tunneling microscopy (including chemistry induced with STM)

International Patent Classification (IPC)

  • B01L

    Chemical or physical laboratory apparatus for general use

  • B82B3/00

    Manufacture or treatment of nano-structures

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3681444

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
(a) Principle of the design of the KoalaDrive. (a) Working principle of the KoalaDrive: concerted interplay between static friction and sliding friction. If only one spring moves, the tube is hold stationary by the other two. The motion of the springs during the different steps of a cycle is indicated by arrows. If two springs move simultaneously, the central tube moves together with them. (b) Photo of the KoalaDrive. (c) Another variant of the KoalaDrive design where the two piezoelectric tubes are coaxially stacked into each other.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
Voltage pattern applied to both piezo tubes and the resulting motion of the central tube as function of time.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
KoalaDrive performance: single step displacement as function of signal amplitude. (a) The data are shown for a KoalaDrive with a total piezo length (sum of both piezo elements) of 10 mm at room temperature, liquid nitrogen temperature, and at 10 K. (b) Data for a KoalaDrive with a total piezo length of 20 mm.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
(a) Design of a single tip STM using the KoalaDrive leading to a minimal size STM. (b) Photograph of an actual KoalaDrive STM.

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.5
(a) Atomically resolved unfiltered STM image of the (7×7) structure on a Si(111) sample (lateral scan size 30 nm × 30 nm). (b) Line scan (not averaged) through the red line in (a).

FIG.5 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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