Atomically resolved scanning tunneling microscope for use in a 42 T resistive magnet

High magnetic field Scanning Tunneling Microscopy (STM) is an essential tool for investigating the rich physical properties of materials. However, due to the extreme difficulty of designing an ultra-stable STM head and the strict requirements for the imaging environment, most reported STM systems operate only within superconducting magnets with fields below 20 T and minimal vibration. To date, no STM has been reported to achieve atomic resolution inside a huge vibrational water-cooled resistive magnet operating above 40 T In this work, we designed a novel STM head featuring an entirely new structure. The driving motor employs a nested design consisting of inner and outer piezoelectric tubes, which independently control the approach and retraction of the tip relative to the sample. During imaging, the scanner part is mechanically decoupled from the motor, effectively reducing interference from external vibrations. By integrating a custom-designed liquid helium cryostat and a two-stage vibration isolation probe, we achieved atomic-resolution imaging of Highly Oriented Pyrolytic Graphite (HOPG) sample at temperatures ranging from 300 K down to 1.6 K. Furthermore, with the sample temperature maintained at 150 K, we obtained atomic-resolution images of HOPG at magnetic field strength up to 42 T The low drift rates observed in the X-Y-Z directions and the resulting dI/dV spectra demonstrate the high stability and robust spectroscopic capability of this newly constructed STM. This is the world's first STM capable of acquiring atomic-resolution image at ultra-high magnetic field of 42 T Our results are of significant importance for expanding the research scope of STM.