Performance Characterization of a Cryogenic Probe Station attoCPS I
In a series of tests with the attocube systems probestation, Munich researchers have found significant benefits for their research of nano-electro-mechanical structures and related high frequency experiments. In the basic version, the cryogenic probe station consists of four 3-axes positioning stacks (ANPxyz50/LT) allowing to position four probes independently onto a sample with high precision (max. sample diameter: 6 mm).
Differential conductance measurements on Pd break-junctions measured using an attoCPS I
In this application, an attocube 4-point probe station is used to perform tunneling spectroscopy measurements in metallic nanogap devices at cryogenic temperatures. A single nanowire is contacted by two probes and a thermally-assisted electromigration process is employed to create a sub-nanometer tunneling gap.
Nanopositioners independently move each DC probe along the x, y, and z directions, enabling electrical contact to each device in succession. The contacting process is monitored by an inspection optics that provides good optical resolution to securely contact the pads of about 50 - 100 µm in size.