TY  - JOUR
AU  - Esat, Taner
AU  - Borgens, Peter
AU  - Yang, Xiaosheng
AU  - Coenen, Peter
AU  - Cherepanov, Vasily
AU  - Raccanelli, Andrea
AU  - Tautz, F. Stefan
AU  - Temirov, Ruslan
TI  - A millikelvin scanning tunneling microscope in ultra-high vacuum with adiabatic demagnetization refrigeration
JO  - Review of scientific instruments
VL  - 92
IS  - 6
SN  - 0034-6748
CY  - [S.l.]
PB  - American Institute of Physics
M1  - FZJ-2021-02375
SP  - 063701 -
PY  - 2021
AB  - We present the design and performance of an ultra-high vacuum scanning tunneling microscope (STM) that uses adiabatic demagnetization of electron magnetic moments for controlling its operating temperature ranging between 30 mK and 1 K with an accuracy of up to 7 μK rms. At the same time, high magnetic fields of up to 8 T can be applied perpendicular to the sample surface. The time available for STM experiments at 50 mK is longer than 20 h, at 100 mK about 40 h. The single-shot adiabatic demagnetization refrigerator can be regenerated automatically within 7 h while keeping the STM temperature below 5 K. The whole setup is located in a vibrationally isolated, electromagnetically shielded laboratory with no mechanical pumping lines penetrating its isolation walls. The 1 K pot of the adiabatic demagnetization refrigeration cryostat can be operated silently for more than 20 days in a single-shot mode using a custom-built high-capacity cryopump. A high degree of vibrational decoupling together with the use of a specially designed minimalistic STM head provides outstanding mechanical stability, demonstrated by the tunneling current noise, STM imaging, and scanning tunneling spectroscopy measurements, all performed on an atomically clean Al(100) surface.
LB  - PUB:(DE-HGF)16
C6  - 34243501
UR  - <Go to ISI:>//WOS:000692136100001
DO  - DOI:10.1063/5.0050532
UR  - https://juser.fz-juelich.de/record/892836
ER  -