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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Magnetic Force Microscopy (MFM) offers high resolution for studying magnetic materials.
  • Topological magnetic materials and superconductors exhibit complex phenomena requiring advanced characterization.
  • Low-temperature and high-magnetic-field environments are crucial for observing these phenomena.

Purpose of the Study:

  • To construct and demonstrate a novel low-temperature magnetic force microscope (MFM).
  • To achieve high resolution and sensitivity for studying topological magnetic materials and superconductors.
  • To enable vector-field MFM experiments for investigating anisotropic magnetic properties.

Main Methods:

  • Construction of a low-temperature MFM with a 2-2-9 Tesla vector magnet.
  • Implementation of a three-axis fiber-optic alignment system for in situ calibration.
  • Utilized a homebuilt vibration isolation table to minimize mechanical noise.
  • Achieved a minimum detectable force gradient near the thermodynamic limit.

Main Results:

  • Obtained high-resolution magnetic domain images of the van der Waals ferromagnet Fe4GeTe2.
  • Visualized Abrikosov superconducting vortices in an Nb film at low temperatures.
  • Demonstrated vector-field functionality by observing domain transitions in Cr2Ge2Te6 with varying magnetic field angles.

Conclusions:

  • The developed low-temperature MFM provides unprecedented capabilities for studying magnetic materials.
  • Its vector-field functionality is essential for exploring anisotropic phenomena in topological magnets and superconductors.
  • This instrument advances the investigation of quantum materials and their magnetic properties.