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

In English

Författare

  • 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.

Publiceringsår

2007

Språk

Engelska

Publikation/Tidskrift/Serie

Applied Physics Reviews

Volym

101

Issue

11

Dokumenttyp

Artikel i tidskrift

Förlag

American Institute of Physics (AIP)

Ämne

  • Natural Sciences
  • Physical Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1931-9401