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

Författare:
Redaktör:
  • P. James Viccaro
Publiceringsår: 2011
Språk: Engelska
Sidor: 083546-1-083546-5
Publikation/Tidskrift/Serie: Journal of Applied Physics
Volym: 109
Nummer: 8
Dokumenttyp: Artikel
Förlag: American Institute of Physics

Sammanfattning

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.

Disputation

Nyckelord

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

Övrigt

Published
Yes
  • ISSN: 0021-8979

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