18/20 T high magnetic field scanning tunneling microscope with fully low voltage operability, high current resolution, and large scale searching ability

The Review of Scientific Instruments
Quanfeng LiQingyou Lu

Abstract

We present a home-built 18/20 T high magnetic field scanning tunneling microscope (STM) featuring fully low voltage (lower than ±15 V) operability in low temperatures, large scale searching ability, and 20 fA high current resolution (measured by using a 100 GOhm dummy resistor to replace the tip-sample junction) with a bandwidth of 3.03 kHz. To accomplish low voltage operation which is important in achieving high precision, low noise, and low interference with the strong magnetic field, the coarse approach is implemented with an inertial slider driven by the lateral bending of a piezoelectric scanner tube (PST) whose inner electrode is axially split into two for enhanced bending per volt. The PST can also drive the same sliding piece to inertial slide in the other bending direction (along the sample surface) of the PST, which realizes the large area searching ability. The STM head is housed in a three segment tubular chamber, which is detachable near the STM head for the convenience of sample and tip changes. Atomic resolution images of a graphite sample taken under 17.6 T and 18.0001 T are presented to show its performance.

References

Oct 19, 2002·Science·A WachowiakR Wiesendanger
Dec 18, 2002·Physical Review Letters·M MuralidharM Murakami
Aug 4, 2007·The Review of Scientific Instruments·H KambaraHiroshi Fukuyama
Dec 3, 2008·The Review of Scientific Instruments·Yubin HouQingyou Lu

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Citations

Jan 3, 2013·The Review of Scientific Instruments·Wei TaoQingyou Lu
Jun 4, 2020·The Review of Scientific Instruments·Jihao WangQingyou Lu

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