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We present a probe-type scanning tunneling microscope (STM) with atomicresolution that is designed to be directly inserted and work in a harshvibrational cryogen-free superconducting magnet system. When a commercialvariable temperature insert (VTI) is installed in the magnet and the STM is inturn housed in the VTI, a lowest temperature of 1.6 K can be achieved, wherethe STM still operates well. We have tested it in an 8 T superconducting magnetcooled with the pulse-tube cryocooler (PTC) and obtained atomically revolvedgraphite and NiSe2 images as well as the scanning tunneling spectrum (STS, i.e.dI/dV spectrum) data of the latter near its critical temperature, which showthe formation process of the superconducting gap as a function of temperature.The drifting rates of the STM at 1.6 K in X-Y plane and Z direction are 1.15and 1.71 pm/min respectively. Noise analysis for the tunneling current showsthat the amplitudes of the dominant peaks (6.84 and 10.25Hz) are low. This isimportant as a cryogen-free magnet system has long been considered too harshfor any atomic resolution measurement.

Atomically resolved probe-type scanning tunneling microscope for use in harsh vibrational cryogen-free superconducting magnet