Atomic resolution scanning tunneling microscope imaging up to 27 T in a water-cooled magnet
scanning tunneling microscopy, water-cooled magnet, strong magnetic field, TunaDriver piezoelectric motor, highly oriented pyrolytic graphite
We report the first atomically resolved scanning tunneling microscope (STM) imaging in a water-cooled magnet (WM), for which extremely harsh vibrations and noise have been the major challenge. This custom WM-STM features an ultra-rigid and compact scan head in which the coarse approach is driven by our newly designed TunaDrive piezoelectric motor. A three-level spring hanging system is used for vibration isolation. Room-temperature raw-data images of graphite with quality atomic resolution were acquired in the presence of very strong magnetic fields, with a field strength up to 27 T, in a 32-mm-diameter bore WM with a maximum field strength of 27.5 T at a power rating of 10 MW, calibrated by nuclear magnetic resonance (NMR). This record field strength of 27 T exceeds the maximal field strength achieved by the conventional superconducting magnets. Besides, our WM-STM has paved the way to STM imaging using a 45 T, 32-mm-diameter bore hybrid magnet, which is the world’s flagship magnet, producing the strongest steady magnetic field.
Tsinghua University Press
Wenjie Meng,Ying Guo,Yubin Hou,Qingyou Lu, Atomic resolution scanning tunneling microscope imaging up to 27 T in a water-cooled magnet. NanoRes.2015, 8(12): 3898–3904