Aahrus Specs VT-AFM/STM

Ubicación:Location: lma - zaragoza

77€ /Day<br> (With technician: +29,5€/Hour)
65€ /Day<br> (With technician: +29,5€/Hour)
77€ /Day<br> (With technician: +29,5€/Hour)
101€ /Day<br> (With technician: +29,5€/Hour)
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The laboratory of Low Temperature, Ultra High Vacuum (UHV-LT) is specifically designed for surface science microscopy and spectroscopy methods. The aim is to cover a wide variety of problems in surface science, from molecular chemistry to atomic magnetism.

Three systems available in our laboratory are equipped with different preparation techniques under UHV conditions, as well as with a large variety of epitaxial growth facilities. Force- and Tunnel-based methodologies can be combined, allowing investigating substrates with different electronic properties. The accessible temperature range for experiments is from 0.5 K to 1300 K.
The laboratory is composed by three UHV set-ups hosting 4 different SPM heads, each with complementary characteristics:
  1. Joule Thompson STM with axial magnetic field: SPECS JT-STM.
  2. AFM/STM with variable temperature: Aahrus VT-AFM/STM.
  3. Low temperature STM/AFM in UHV: Omicron LTqPlus.


AFM/STM with variable temperature: Aahrus VT-AFM/STM


This equipment is specifically oriented to investigate atomic scale magnetism and to high resolution spectroscopy (0.1 meV) of molecules and atoms, as well as to study the physical-chemical phenomena of surfaces function of temperature and gas dosing.
Both aspects are covered by two UHV SPM heads connected under UHV conditions as a part of a multichamber system. One of them –Specs JT– features a base temperature of 1.1 K (can be extended down to 0.5 K by using He3 instead of He4 in the Joule-Thompson stage), a 3 Tesla axial field and a hold time of 100 h. Spin-Polarized STM measurements can be performed routinely. The other one –Aahrus Specs VT– is a variable temperature STM/nc-AFM (from 100 K to 1300 K), with a fast and flexible measurement approach. Two additional chambers with independent vacuum allow the user the preparation of samples in situ and the epitaxial growth of organic and inorganic thin films on surfaces.

What kind of information can be obtained with this instrument?

  • Energy spectra of the density of states and quantum energy levels of atomic scale objects.
  • Electronic and structural properties of surfaces with atomic resolution.
  • Spin structure and magnetization curves of magnetic nano-objects from the range of ~100 nm down to sub-atomic and sub-molecular resolution.
  • Engineering functional nanostructures by atomic manipulation.
  • Real time monitoring of catalytical activity as a function of temperature and reacting gases.
  • Physical chemical characterization of surface steered self-assembly processes. 

Sample requirements:

  • Preferably grown in-situ.
  • Metallic, semiconducting or ultra-thin (≤3 monolayer) insulating surfaces.
  • Surface roughness < 1 nm.
  • Substrate or specimen maximum size: 3 mm thick and 10 mm wide.  

Technical Specifications:

  • Variable Temperature STM. Variable Temperature AFM in non contact mode. SPECS GmbH. 

Sample preparation:

  • LEED/Auger characterization facilities; 9 Molecular Beam Epitaxy pockets (5 of them with fast reload option), 1 effusion cell, 3 sputter guns, 4 e-beam heaters, 2 in-situ transportable resistive crucibles for deposition of organic materials, SP-STM tip preparation.


Caption: From left to right. Binary information encoded in single Co atoms with up/down spin represented by yellow/red colors. The same chain with contrast reversed. Example of energy resolution in quantum spectra (Co atoms over Cu2N monolayer). Ni3C4 over a Ni (111) surface stabilized by a partial pressure of 10-6 mbar propene at 500 ºC. Example of atomic manipulation to build the logo of ‘Tercer Milenio 20’ using 44 atoms.