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Structure and magnetism of MnAs nanocrystals embedded in GaAs as a function of post-growth annealing temperature

Author

  • A. Kwiatkowski
  • D. Wasik
  • M. Kaminska
  • R. Bozek
  • J. Szczytko
  • A. Twardowski
  • J. Borysiuk
  • Janusz Sadowski
  • J. Gosk

Summary, in English

Self-organized Ga(Mn)As nanoclusters, embedded in GaAs, were formed during post-growth thermal annealing of Ga1-xMnxAs layers. Structural and magnetic properties of such composites were systematically studied as a function of the annealing temperature. Small (similar to 3 nm) Mn-rich zinc-blende Mn(Ga)As clusters, coherent with the GaAs matrix, were formed at the annealing temperature of 500 degrees C. An increase of the annealing temperature of up to 600 degrees C led to the creation of 10-20 nm large NiAs-type hexagonal MnAs nanocrystals. Magnetization measurements showed that the MnAs nanoprecipitates were superparamagnetic, with a distribution of blocking temperatures that depended on the MnAs cluster size. Some intermediate paramagnetic clusters (structurally disordered clusters) were also observed. (c) 2007 American Institute of Physics.

Department/s

Publishing year

2007

Language

English

Publication/Series

Applied Physics Reviews

Volume

101

Issue

11

Document type

Journal article

Publisher

American Institute of Physics (AIP)

Topic

  • Natural Sciences
  • Physical Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 1931-9401