Quantitative phase imaging of nanoscale electrostatic and magnetic fields using off-axis electron holography

Martha R. McCartney*, Nipun Agarwal, Suk Chung, David A. Cullen, Myung Geun Han, Kai He, Luying Li, Hua Wang, Lin Zhou, David J. Smith

*Corresponding author for this work

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

Off-axis electron holography in the transmission electron microscope is a powerful interferometric technique that enables electrostatic and magnetic fields to be imaged and quantified with spatial resolution often approaching the nanometer scale. Here, we demonstrate the capabilities of the technique for phase quantification at the nanoscale by briefly reviewing some of our recent studies of nanostructured materials. Examples that are described include determination of the electrostatic potential profiles associated with doped Si- and GaAs-based semiconductor devices, measurement of hole accumulation in Ge quantum dots, mapping of polarization fields in III-nitride heterostructures, and observation of the remanent states and reversal mechanisms of lithographically patterned magnetic nanorings. Some issues associated with sample preparation for doped semiconductor heterostructures are also briefly discussed.

Original languageEnglish (US)
Pages (from-to)375-382
Number of pages8
JournalUltramicroscopy
Volume110
Issue number5
DOIs
StatePublished - Apr 1 2010

Keywords

  • Magnetization reversal
  • Off-axis electron holography
  • Polarization fields
  • Semiconductor devices

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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    McCartney, M. R., Agarwal, N., Chung, S., Cullen, D. A., Han, M. G., He, K., Li, L., Wang, H., Zhou, L., & Smith, D. J. (2010). Quantitative phase imaging of nanoscale electrostatic and magnetic fields using off-axis electron holography. Ultramicroscopy, 110(5), 375-382. https://doi.org/10.1016/j.ultramic.2010.01.001