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@ARTICLE{Sadowski:201614,
author = {Sadowski, Janusz and Domagala, Jaroslaw Z and Mathieu,
Roland and Kovacs, Andras and Dłużewski, Piotr},
title = {{F}ormation of two-dimensionally confined superparamagnetic
({M}n, {G}a){A}s nanocrystals in high-temperature annealed
({G}a, {M}n){A}s/{G}a{A}s superlattices},
journal = {Journal of physics / Condensed matter},
volume = {25},
number = {19},
issn = {1361-648X},
address = {Bristol},
publisher = {IOP Publ.},
reportid = {FZJ-2015-03908},
pages = {196005 -},
year = {2013},
abstract = {The annealing-induced formation of (Mn, Ga)As nanocrystals
in (Ga, Mn)As/GaAs superlattices was studied by x-ray
diffraction, transmission electron microscopy and
magnetometry. The superlattice structures with 50 Å thick
(Ga, Mn)As layers separated by 25, 50 and 100 Å thick GaAs
spacers were grown by molecular beam epitaxy at low
temperature (250 ° C), and then annealed at high
temperatures of 400, 560 and 630 ° C. The
high-temperature annealing causes decomposition to a (Ga,
Mn)As ternary alloy and the formation of (Mn, Ga)As
nanocrystals inside the GaAs matrix. The nanocrystals are
confined in the planes that were formerly occupied by (Ga,
Mn)As layers for the up to 560 ° C annealing and diffuse
throughout the GaAs spacer layers at 630 ° C annealing.
The two-dimensionally confined nanocrystals exhibit a
superparamagnetic behavior which becomes high-temperature
ferromagnetism (~350 K) upon diffusion.},
cin = {PGI-5},
ddc = {530},
cid = {I:(DE-Juel1)PGI-5-20110106},
pnm = {42G - Peter Grünberg-Centre (PG-C) (POF2-42G41)},
pid = {G:(DE-HGF)POF2-42G41},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000318070100027},
pubmed = {pmid:23603378},
doi = {10.1088/0953-8984/25/19/196005},
url = {https://juser.fz-juelich.de/record/201614},
}