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A hybrid magnet based scanning tunneling microscope.

Jihao Wang1, Tao Geng1, Wenjie Meng1

  • 1Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory and High Magnetic Field Laboratory of Anhui Province, Chinese Academy of Sciences, Hefei, Anhui 230031, China.

The Review of Scientific Instruments
|June 4, 2020
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Summary
This summary is machine-generated.

This study introduces a novel scanning tunneling microscope (STM) capable of operating in ultrahigh magnetic fields up to 27.5 Tesla. The developed STM achieves high stability and performance, enabling detailed imaging of materials under extreme conditions.

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Area of Science:

  • Materials Science
  • Physics
  • Nanotechnology

Background:

  • Scanning Tunneling Microscopy (STM) is a powerful surface analysis technique.
  • Operating STM in high magnetic fields presents significant challenges due to magnetic interference and vibrations.
  • Previous STMs were limited in their operational magnetic field strength.

Purpose of the Study:

  • To develop and demonstrate a Scanning Tunneling Microscope (STM) that can operate within a 27.5 Tesla magnetic field.
  • To achieve stable and high-resolution imaging under ultrahigh magnetic field conditions.
  • To enable new avenues for materials characterization in extreme environments.

Main Methods:

  • A custom-built STM head was designed using nonmagnetic materials.
  • An inertial piezoelectric motor was employed for coarse approach, and a miniature scanner for scanning.
  • A multi-stage vibration isolation system (brick-rubber-brick, springs) and a copper shield were implemented.
  • The STM was tested within a hybrid magnet system.

Main Results:

  • The STM successfully operated in magnetic fields up to 27.5 T.
  • High-resolution graphite hexagonal lattice images were obtained at various magnetic field strengths.
  • Achieved low drift rates of 26.2 pm/min (X-Y) and 34.6 pm/min (Z) under ambient conditions.
  • Demonstrated stable imaging without vacuum or low temperatures.

Conclusions:

  • This work presents the first STM operating in a hybrid magnet and achieving high-quality imaging up to 27.5 T.
  • The developed STM significantly enhances the capability for surface studies under ultrahigh magnetic fields.
  • The findings pave the way for advanced materials research in extreme magnetic environments.