Suppressing Geometric Phase Shift Owing to Antiphase Boundaries in Dark-Field Electron Holography

Antiphase boundaries (APBs) formed in Fe70Al30 alloy have attracted significant attention because they intensify ferromagnetic spin order by atomic disordering. Electron holography can be a useful tool for examining the magnetism in APB regions, although the observations suffer from an undesired contribution from an additional geometric phase shift in the incident electron wave. This paper proposes a method based on dark-field electron holography to suppress the unwanted geometric phase shift owing to APBs in electron holograms. The results of this study yield useful information for examining APBs and other planar defects in ordered crystals.