TY  - JOUR
AU  - Sadowski, Janusz
AU  - Domagala, Jaroslaw Z
AU  - Mathieu, Roland
AU  - Kovacs, Andras
AU  - Dłużewski, Piotr
TI  - Formation of two-dimensionally confined superparamagnetic (Mn, Ga)As nanocrystals in high-temperature annealed (Ga, Mn)As/GaAs superlattices
JO  - Journal of physics / Condensed matter
VL  - 25
IS  - 19
SN  - 1361-648X
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2015-03908
SP  - 196005 -
PY  - 2013
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000318070100027
C6  - pmid:23603378
DO  - DOI:10.1088/0953-8984/25/19/196005
UR  - https://juser.fz-juelich.de/record/201614
ER  -