Features of the CreaTec LT-STM/AFM


CreaTec‘s LT-STM was developed with Dr. Gerhard Meyer at the FU Berlin in the group of Prof. Rieder. Following the needs of our customers this instrument is continuously being improved. It is very well known for its outstanding stability and performance in the scientific community.

The LT-STM is specially designed for working at atomic scale at low temperature (i.e. to perform atomic/molecular manipulation or local spectroscopy). The compact design ensures its high stability (dz<1pm).

The SPM is thermally isolated. Its temperature can be varied between 5 and 300K. The low temperature of the SPM freezes the motion of most adsorbates which can be evaporated onto the sample surface either inside or outside the SPM. The surface/adsorbates can be investigated for weeks. No degradation of the sample will be observed as long as the 4K radiation shield, that surrounds the SPM, remains cold.

Due to the design of the cryostat, very low helium consumption is achieved, which requires to refill only 4l of liquid helium every 72 hours when the SPM is at its lowest temperature.

The whole scan unit is digitally controlled. Therefore a precise tip positioning on any spot of the sample with any set of tunneling parameters can be made. This can be used to do local spectroscopic measurements (i.e.I(V), I(Z)) to reveal electronic or vibrational properties of the sample or the interaction between tip and sample, and to perform different kinds of manipulation techniques. Any information (I(t), U(t), XYZ(t), dI/dU…) can be recorded during manipulation. The standard scan range of 1.2μm x 1.2μm x 0.2μm may be adapted according to the customer‘s requirements. The minimum tunneling current is 2pA (200fA using our internal preamplifier).

The system provides optical access to the sample surface to control the exact position of the tip with the help of a telescope and to perform optical spectroscopy.

The sample transfer can also be done at low temperature. A helium cooled manipulator allows you to prepare, analyse and transfer the samples at temperatures down to 15K.

Superconducting coils providing in- and out-of-plane magnetic fields can be included according to the customer‘s needs.