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We present the design and performance of an ultra-high vacuum (UHV) scanningtunneling microscope (STM) that uses adiabatic demagnetization of electronmagnetic moments for controlling its operating temperature in the range between30 mK and 1 K with the accuracy of up to 7 $\mu$K. The time available for STMexperiments at 50 mK is longer than 20 h, at 100 mK about 40 h. The single-shotadiabatic demagnetization refrigerator (ADR) can be regenerated automaticallywithin 7 hours while keeping the STM temperature below 5 K. The whole setup islocated in a vibrationally isolated, electromagnetically shielded laboratorywith no mechanical pumping lines penetrating through its isolation walls. The1K pot of the ADR cryostat can be operated silently for more than 20 days in asingle-shot mode using a custom-built high-capacity cryopump. A high degree ofvibrational decoupling together with the use of a specially-designedminimalistic STM head provides an outstanding mechanical stability,demonstrated by the tunneling current noise, STM imaging, and scanningtunneling spectroscopy measurements all performed on atomically clean Al(100)surface.

A millikelvin scanning tunneling microscope in ultra-high vacuum with adiabatic demagnetization refrigeration