Benchmarking UHV scanning tunneling microscopy (STM) and AFM technology
VT SPM from Scienta Omicron
The Scienta Omicron VT SPM is a well-established microscope in many research labs for scanning probe microscopy. To date, more than 500 instruments have been delivered and successfully installed around the world. The volume of research results and publications is a conclusive proof for the performance, quality, and versatility of the Variable Temperature SPM design. It won the prominent R&D award in 1996.
|25 K – 1500 K|
|True pA STM|
|Improved dI/dV spectroscopy|
|Beam deflection AFM|
|‘QPlus sensor’ AFM|
State-of-the-art STM technology
The variable temperature SPM uses the latest preamplifier technology for true sub-pA scanning tunneling microscopy and spectroscopy. Stable low current operation is important for the investigation of surfaces that are sensitive or have a low conductivity. For modulation spectroscopy an electronic compensation reduces the influence of parasitic currents. This saves acquisition time and improves results.
Superior AFM technology
The AFM technology of the variable temperature SPM is based on more than 20 years of experience in atomic force microscopy in UHV. It has been continuously developed and improved. The classic beam deflection AFM for contact and non-contact AFM offers the flexibility for many operational modes and different cantilever types. For example high resolution AFM, friction force microscopy, electrostatic force microscopy (EFM), scanning Kelvin probe microscopy (SKPM) and magnetic force microscopy (MFM) are available.
The latest major development is a new AFM preamplifier which increases the detection bandwidth from 450 kHz to 2 MHz. In combination with the new AFM electronics (PLL) of the MATRIX Control System, users can now use high resonant frequency cantilevers for high speed non-contact AFM measurements.
This new preamplifier technology in combination with an improved light source is also available as an upgrade package for existing variable temperature AFM’s.
The new “QPlus” sensor, based on a tuning fork design, is today extending the possible application range of the variable temperature SPM.