10 mK, 14 T Scanning Tunneling Microscope
We have developped a hybrid AFM-STM operating at mK temperatures and up to 14 T.
The AFM-STM enables us to scan large surfaces in AFM mode on insulating substrate in order to locate nanodevices, and then switch to STM mode on conductive surfaces to perform tunneling spectroscopy.
Two different setups are operating in a low-loss helium cryostat equipped with a 14 teslas, 100 mm cold bore superconducting solenoid.
- Home-made 4K insert working with exchange gas,
- Custom-designed UHV dilution unit (designed by Cryoconcept) cooling down to 0.02 K base temperature coupled to a UHV chamber for tip and sample preparation.