New trend in electron holography

Toshiaki Tanigaki, Ken Harada, Yasukazu Murakami, Kodai Niitsu, Tetsuya Akashi, Yoshio Takahashi, Akira Sugawara, Daisuke Shindo

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Electron holography using a coherent electron wave is a promising technique for high-resolution visualization of electromagnetic fields in and around objects. The capability of electron holography has been enhanced by the development of new technologies and has thus become an even more powerful tool for exploring scientific frontiers. This review introduces these technologies including split-illumination electron holography and vector-field electron tomography. Split-illumination electron holography, which uses separated coherent waves, overcomes the limits imposed by the lateral coherence requirement for electron waves in electron holography. Areas that are difficult to observe using conventional electron holography are now observable. Exemplified applications include observing a singular magnetic domain wall in electrical steel sheets, local magnetizations at anti-phase boundaries, and electrostatic potentials in metal-oxide-semiconductor field-effect transistors. Vector-field electron tomography can be used to visualize magnetic vectors in three dimensions. Two components of the vectors are reconstructed using dual-axis tomography, and the remaining one is calculated using div B = 0. A high-voltage electron microscope can be used to achieve precise magnetic reconstruction. For example, magnetic vortices have been visualized using a 1 MV holography electron microscope.

Original languageEnglish
Article number244001
JournalJournal of Physics D: Applied Physics
Volume49
Issue number24
DOIs
Publication statusPublished - 2016 May 12

Keywords

  • domain wall
  • electron holography
  • electrostatic potential
  • magnetic vector
  • split-illumination
  • three-dimensional observation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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  • Cite this

    Tanigaki, T., Harada, K., Murakami, Y., Niitsu, K., Akashi, T., Takahashi, Y., Sugawara, A., & Shindo, D. (2016). New trend in electron holography. Journal of Physics D: Applied Physics, 49(24), [244001]. https://doi.org/10.1088/0022-3727/49/24/244001