A cost effective concept for lower temperatures scanning probe microscopy

Fermi SPM from Scienta Omicron

The new Fermi SPM is a compact solution for ultra-high vacuum (UHV) scanning probe microscopy (SPM) in a temperature range from 15 K to 400 K.
The new Fermi SPM offers a cost effective alternative for users with a stronger focus on tunneling spectroscopy experiments. It has been developed to close the gap between the established Omicron LT STM for ultimate spectroscopy performance and the flexible concept of the Omicron VT series.

15 K – 400 K, low thermal drift
Compact design
Tip exchange & 2D coarse
Sample and tip cooled
Sub pA scanning tunneling microscopy (STM), atomic force microscopy (AFM) & Spectroscopy

Sample and tip cooled

The compact design uses a LHe flow cryostat. In contrast to the VT series (sample cooled, tip at room temperature), thermal shields keep tip and sample in the Fermi SPM at low temperature during cooling experiments. This guarantees low thermal drift between tip and sample and makes the Fermi SPM an ideal and cost effective solution for imaging, tunneling spectroscopy and atom manipulation experiments.

The compact Fermi SPM is mounted on a DN 100 CF flange and easy to integrate on systems using the proven bolt-on concept.

Compact scanner design

A new compact and rigidly mounted scanner with light and small tip carriers enables high stability and high speed scanning. The sample is mounted on a coarse positioning device for sample positioning in x and z direction. Four electrical sample contacts are available as an option. Two ports with optical access and one port for in-situ evaporation experiments are realized. AFM operation (QPlus AFM) is also available as an option.

Unique in-situ tip exchange An unique tip exchange mechanism for the Fermi SPM, allows the sample to remain in position at low temperature while the tip is quickly and safely exchanged. A wobble stick and a tip loading stage are used to pick up tips from carrier plates. The tip itself is inserted into the scanner by a bayonet-like locking mechanism within seconds. Due to the special design there is no risk of damage to the scanner. The thermal shield door is quickly opened for tip exchange employing a wobble stick. The sample stays in the microscope and remains at low temperature during the tip exchange.


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