Key Features

  • Rigid design with small footprint
  • STM, AFM & spectroscopy
  • Compatible with low temperatures down to mK range
  • Entirely non-magnetic design
  • Orthogonal 3D coarse motion
  • Independent tip and sample exchange
  • Easy handling

The ultra-compact TRIBUS is a universal SPM for a wide variety of applications. Whether for SPM-spectroscopy, surface imaging, or manipulation of nanoparticles, for experiments at elevated temperatures or at the milli-Kelvin scale, in high magnetic fields or in spatially tight environments, the TRIBUS-SPM is the ideal choice whenever highest resolution, accuracy and flexibility are required.

Integration into nearly every UHV environment is possible due to its small footprint, non-magnetic materials, and compatibility with a wide temperature range. Special attention and focus were put into proper choice and pre-characterization of the materials comprising the TRIBUS.

As a result it has a minimal thermal drift and optimum stiffness, which yields excellent stability in the SPM. Aspects such as 3D coarse motors with independent and orthogonal axes, and easy and safe in-situ tip and sample exchange, facilitate ease of daily work. And additional features such as multiple electrical sample contacts and optical access ports extend the possible applications beyond standard SPM measurements. 

Optical access

 Multiple access ports for in-situ evaporation, optical observation/illumination, and in-situ tip and sample exchange

Multiple Sample Contacts

In addition to the standard sample contact, the sample acceptor stage carries up to 10 electrical contacts. 

Standard sample plate (various materials available)

Standard sample plate (various materials available)

Cost effective metal tip carriers (consumable); various materials available

Cost effective metal tip carriers (consumable); various materials available

Sample plate with multiple electrical contacts

Sample plate with multiple electrical contacts 

Many more sample plates, sensors & carriers coming soon 

Optional second adapter for integration of heater and/or touch control detectors

SPM measurement head:

  • Compact footprint: h=80mm and diameter=35mm
  • Piezo tube scanner (scanning tip)
  • 3D coarse positioning: 2D horizontal sample movement Vertical movement of tip & scanner
  • Tip and sample at same temperature
  • Excellent signal shielding

Adapter for spring suspension and/or connector terminal; optional according to experimental requirements

STM, STS, qPlus®, I(V), dI/dU, dI/dz, IETS, atom/molecule/nanoparticle manipulation, df(z), df(U), SP-STM, ...


STM results below 1K

STM measurements with Tribus-Ultra in an 3He UHV cryostat system: Au(111) at 593mK (left)  and at 670mK (right).

Scanning Tunneling Spectroscopy (STS) below 1K

For evaluation of Tunneling Spectroscopy performance, a superconducting NbSe2 sample was used.

Every spectrum is a single spectrum (i.e. not averaged over several spectra) clearly showing the superconducting energy gap (200 points/spectrum; 117Hz; settling parameters: 7mV, 220pA). The amplitude of the modulation voltage can be reduced to far below 100µVrms to ensure that the energy resolution is mainly dominated by the STM temperature and not by the modulation voltage.

STS: Variation of Voltage modulation

Demonstration of compatibility with high magnetic fields

Because of its small atomic corrugation of only a few pm, a Au(111) sample was used as a reference to demonstrate the high stability of the TRIBUS STM head at low temperatures and in high magnetic fields. Over the full range from B= -12T to B=+12T atomic resolution on Au(111) has been achieved without any readjustment of the SPM system.

B=+7T, T=589mK
B=+9T, T=589mK
B=+12T, T=679mK
B=-12T, T=585mK

STM at 10K with Sigma Flow Cryostat UHV SPM system

Au(111) at 10K

qPlus® Results

qPlus® on NaCI(001) @ 20K

df(z) spectroscopy (qPlus®) on NaCl(001) at 20K