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A Cryostat Applicable to Long-Wavelength Light-Driven Scanning Probe Microscopy.

Kui Xiang1,2, Caihong Xie1,2, Qiyuan Feng1,2,3

  • 1High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.

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Summary

A new optical cryostat enables lightwave-driven scanning probe microscopy (LD-SPM) under magnetic fields. This compact system minimizes vibrations and light loss, allowing detailed imaging of materials at cryogenic temperatures.

Keywords:
ANSYScryostatlong-wavelength lightmagnetic fieldscanning probe microscopy

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Growing interest in lightwave-driven scanning probe microscopy (LD-SPM) to surpass the Abbe diffraction limit.
  • Need for advanced microscopy techniques to study energy coupling and internal material information.
  • Requirement for specialized equipment to perform LD-SPM under magnetic fields and at cryogenic temperatures.

Purpose of the Study:

  • To design and demonstrate a compact and efficient optical cryostat for LD-SPM testing under magnetic fields.
  • To overcome limitations of existing cryostats, such as vibration and light loss.
  • To enable high-resolution imaging of materials at cryogenic temperatures and in magnetic fields.

Main Methods:

  • Development of a novel optical cryostat featuring a multilayer radiation shielding insert (MRSI).
  • Utilizing heat conducting gas within the MRSI to create a temperature gradient, eliminating the need for an optical window in the cooling shell.
  • Employing gate valves and bellows for simplified sample and working cell replacement.
  • Performing steady-state thermal analysis using ANSYS software to validate the MRSI design.
  • Utilizing a self-made lightwave-driven magnetic force microscope for imaging.

Main Results:

  • Demonstration of a compact optical cryostat enabling LD-SPM under magnetic fields.
  • Successful imaging of topography and magnetic domains in La$_{0.67}$Ca$_{0.33}$MnO$_{3}$ thin films at cryogenic temperatures.
  • Achieved high resolution and low noise spectra, indicating excellent temperature stability and minimal vibration.
  • Validation of the MRSI design through thermal simulations, highlighting the importance of flexible copper shielding strips.

Conclusions:

  • The developed optical cryostat is effective for LD-SPM under magnetic fields and cryogenic conditions.
  • The cryostat design minimizes vibration and light loss, enhancing imaging performance.
  • This work provides a foundation for developing similar cryostats for diverse optical applications requiring cryogenic temperatures.