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Voids and Mn-rich inclusions in a (Ga,Mn)As ferromagnetic semiconductor investigated by transmission electron microscopy

Author

  • A. Kovacs
  • Janusz Sadowski
  • T. Kasama
  • J. Domagala
  • R. Mathieu
  • T. Dietl
  • R. E. Dunin-Borkowski

Summary, in English

Voids adjacent to cubic (ZnS-type) and hexagonal (NiAs-type) Mn-rich nanocrystals are characterized using aberration-corrected transmission electron microscopy in an annealed Ga(0.995)Mn(0.005)As magnetic semiconductor specimen grown by molecular beam epitaxy. Nanobeam electron diffraction measurements suggest that the nanocrystals exhibit deviations in lattice parameter as compared to bulk MnAs. After annealing at 903 K, the magnetic transition temperature of the specimen is likely to be dominated by the presence of cubic ferromagnetic nanocrystals. In situ annealing inside the electron microscope is used to study the nucleation, coalescence, and grain growth of individual nanocrystals.

Department/s

Publishing year

2011

Language

English

Pages

1-083546

Publication/Series

Applied Physics Reviews

Volume

109

Issue

8

Document type

Journal article

Publisher

American Institute of Physics (AIP)

Topic

  • Physical Sciences
  • Natural Sciences

Keywords

  • molecular beam epitaxial growth
  • transmission electron microscopy
  • nanostructured materials
  • magnetic semiconductors

Status

Published

ISBN/ISSN/Other

  • ISSN: 1931-9401