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Development of compact Cs corrector for desktop electron microscope.

Wei-Yu Chang1, Fu-Rong Chen1

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Summary
This summary is machine-generated.

Compact hexapole correctors using permanent magnets and tunable coils improve desktop electron microscopes (desktop EMs). This technology enhances spatial resolution to sub-0.5nm, enabling advanced nanoscale imaging.

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Area of Science:

  • Materials Science
  • Physics
  • Electron Microscopy

Background:

  • Desktop electron microscopes (desktop EMs) offer ~1nm resolution.
  • Further resolution and signal-to-noise improvements require compact aberration correctors.

Purpose of the Study:

  • To develop a compact hexapole corrector for desktop EMs.
  • To achieve sub-0.5nm spatial resolution using permanent magnets and tunable coils.

Main Methods:

  • Implemented permanent magnets with a tunable coil as a transfer lens doublet.
  • Designed a compact hexapole corrector integrated with the transfer lens.
  • Utilized tunable lens for magnetic field adjustment to compensate for errors.

Main Results:

  • Generated a negative spherical aberration (Cs).
  • Avoided second-order axial astigmatism.
  • Achieved a final spot size better than 0.5nm for a field emission source.

Conclusions:

  • A compact hexapole corrector using permanent magnets and tunable coils is feasible for desktop EMs.
  • This design enables sub-0.5nm resolution, significantly advancing nanoscale imaging capabilities.