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Structural and magnetic properties of nanoclusters in GaMnAs granular layers

Lawniczak-Jablonska, K.; Bak-Misiuk, J.; Dynowska, E.; Romanowski, P.; Domagala, J. Z.; Libera, J.; Wolska, A.; Klepka, M. T.; Dluzewski, P. and Sadowski, Janusz LU , et al. (2011) In Journal of Solid State Chemistry 184(6). p.1530-1539
Abstract
Structural and magnetic properties of GaAs thin films with embedded nanoclusters were investigated as a function of the annealing temperature and Mn content. Surprisingly, the presence of two kinds of nanoclusters with different structure was detected in most of the samples independently of the thermal processing or Mn content. This proved that the presence of a given type of clusters cannot be assumed a priori as is reported in many papers. The fraction of Mn atoms in each kind of cluster was estimated from the extended X-ray absorption fine structure analysis. This analysis ruled out the possibility of the existence of nanoclusters containing a hypothetic MnAs cubic compound-only (Ga,Mn)As cubic and hexagonal MnAs clusters were detected.... (More)
Structural and magnetic properties of GaAs thin films with embedded nanoclusters were investigated as a function of the annealing temperature and Mn content. Surprisingly, the presence of two kinds of nanoclusters with different structure was detected in most of the samples independently of the thermal processing or Mn content. This proved that the presence of a given type of clusters cannot be assumed a priori as is reported in many papers. The fraction of Mn atoms in each kind of cluster was estimated from the extended X-ray absorption fine structure analysis. This analysis ruled out the possibility of the existence of nanoclusters containing a hypothetic MnAs cubic compound-only (Ga,Mn)As cubic and hexagonal MnAs clusters were detected. Moreover the bimodal distribution of Mn magnetic moments was found, which scales with the estimated fraction of Mn atoms in the cubic and hexagonal clusters. (C) 2011 Elsevier Inc. All rights reserved. (Less)
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Contribution to journal
publication status
published
subject
keywords
GaMnAs, Semiconductors, Nanoclusters, Spintronics, Ferromagnetism
in
Journal of Solid State Chemistry
volume
184
issue
6
pages
1530 - 1539
publisher
Elsevier
external identifiers
  • wos:000291332300027
  • scopus:79957487682
ISSN
0022-4596
DOI
10.1016/j.jssc.2011.04.033
language
English
LU publication?
yes
id
2ce14978-e951-4c39-b988-3c426fa0f3b1 (old id 1985299)
date added to LUP
2011-07-06 14:07:34
date last changed
2017-01-01 05:39:15
@article{2ce14978-e951-4c39-b988-3c426fa0f3b1,
  abstract     = {Structural and magnetic properties of GaAs thin films with embedded nanoclusters were investigated as a function of the annealing temperature and Mn content. Surprisingly, the presence of two kinds of nanoclusters with different structure was detected in most of the samples independently of the thermal processing or Mn content. This proved that the presence of a given type of clusters cannot be assumed a priori as is reported in many papers. The fraction of Mn atoms in each kind of cluster was estimated from the extended X-ray absorption fine structure analysis. This analysis ruled out the possibility of the existence of nanoclusters containing a hypothetic MnAs cubic compound-only (Ga,Mn)As cubic and hexagonal MnAs clusters were detected. Moreover the bimodal distribution of Mn magnetic moments was found, which scales with the estimated fraction of Mn atoms in the cubic and hexagonal clusters. (C) 2011 Elsevier Inc. All rights reserved.},
  author       = {Lawniczak-Jablonska, K. and Bak-Misiuk, J. and Dynowska, E. and Romanowski, P. and Domagala, J. Z. and Libera, J. and Wolska, A. and Klepka, M. T. and Dluzewski, P. and Sadowski, Janusz and Barcz, A. and Wasik, D. and Twardowski, A. and Kwiatkowski, A.},
  issn         = {0022-4596},
  keyword      = {GaMnAs,Semiconductors,Nanoclusters,Spintronics,Ferromagnetism},
  language     = {eng},
  number       = {6},
  pages        = {1530--1539},
  publisher    = {Elsevier},
  series       = {Journal of Solid State Chemistry},
  title        = {Structural and magnetic properties of nanoclusters in GaMnAs granular layers},
  url          = {http://dx.doi.org/10.1016/j.jssc.2011.04.033},
  volume       = {184},
  year         = {2011},
}