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

Kwiatkowski, A.; Wasik, D.; Kaminska, M.; Bozek, R.; Szczytko, J.; Twardowski, A.; Borysiuk, J.; Sadowski, Janusz LU and Gosk, J. (2007) In Applied Physics Reviews 101(11).
Abstract
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... (More)
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. (Less)
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Contribution to journal
publication status
published
subject
in
Applied Physics Reviews
volume
101
issue
11
publisher
American Institute of Physics
external identifiers
  • wos:000247306000097
  • scopus:34250661900
ISSN
0021-8979
DOI
10.1063/1.2739215
language
English
LU publication?
yes
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46b4aa37-b43a-4be8-a8e8-480a07dd2b70 (old id 648412)
date added to LUP
2007-12-13 13:51:46
date last changed
2017-04-16 03:33:10
@article{46b4aa37-b43a-4be8-a8e8-480a07dd2b70,
  abstract     = {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.},
  articleno    = {113912},
  author       = {Kwiatkowski, A. and Wasik, D. and Kaminska, M. and Bozek, R. and Szczytko, J. and Twardowski, A. and Borysiuk, J. and Sadowski, Janusz and Gosk, J.},
  issn         = {0021-8979},
  language     = {eng},
  number       = {11},
  publisher    = {American Institute of Physics},
  series       = {Applied Physics Reviews},
  title        = {Structure and magnetism of MnAs nanocrystals embedded in GaAs as a function of post-growth annealing temperature},
  url          = {http://dx.doi.org/10.1063/1.2739215},
  volume       = {101},
  year         = {2007},
}