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Development of a wire corrector for low accelerating voltage scanning electron microscopy.

Tomonori Nakano1, Yu Yamazawa2

  • 1Hitachi, Ltd Research & Development Group, 1-280 Higashi-Koigakubo, Kokubunji-shi 185-8601, Japan.

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A new wire aberration corrector enhances electron microscopy imaging. This compact, cost-effective device improves resolution in scanning electron microscopes (SEMs) by correcting aberrations.

Keywords:
BF-STEMSEMaberration correctionelectron microscopymultipole fieldwire lens

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Area of Science:

  • Electron Microscopy
  • Materials Science

Background:

  • High-resolution imaging in electron microscopy relies on aberration correctors.
  • Conventional aberration correctors are complex and costly, limiting their use in standard scanning electron microscopes (SEMs), especially for low-voltage applications.

Purpose of the Study:

  • To develop and demonstrate a compact and cost-effective wire aberration corrector for SEMs.
  • To improve imaging performance in standard SEM systems.

Main Methods:

  • A wire aberration corrector using symmetrically arranged current lines was designed and implemented.
  • The corrector generated multipole fields (quadrupole to dodecapole).
  • It was integrated into a cold field emission SEM operating at 30 kV with a bright-field STEM detector.

Main Results:

  • Successful generation of quadrupole to dodecapole fields was achieved.
  • Effective correction of spherical aberration was demonstrated.
  • Improved imaging of carbon multilayers was observed.

Conclusions:

  • Wire aberration correctors offer a compact and cost-effective solution for enhancing SEM imaging performance.
  • The principles of wire aberration correction can be adapted for other electron microscopy techniques like TEM and STEM.