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

  • A. Kwiatkowski
  • D. Wasik
  • M. Kaminska
  • R. Bozek
  • J. Szczytko
  • A. Twardowski
  • J. Borysiuk
  • Janusz Sadowski (Dr)
  • J. Gosk
Publiceringsår: 2007
Språk: Engelska
Publikation/Tidskrift/Serie: Journal of Applied Physics
Volym: 101
Nummer: 11
Dokumenttyp: Artikel
Förlag: American Institute of Physics


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.



  • Physics and Astronomy


  • ISSN: 0021-8979

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