Formation of two-dimensionally confined superparamagnetic (Mn, Ga)As nanocrystals in high-temperature annealed (Ga, Mn)As/GaAs superlattices
(2013) In Journal of Physics: Condensed Matter 25(19). p.6-196005- 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 °... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3635954
- author
- Sadowski, Janusz LU ; Jaroslaw Z, Domagala ; Roland, Mathieu ; Andras, Kovacs and Piotr, Dluzewski
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- ferromagnetic semiconductors, magnetic nanocrystals, Molecular Beam Epitaxy
- in
- Journal of Physics: Condensed Matter
- volume
- 25
- issue
- 19
- pages
- 6 - 196005
- publisher
- IOP Publishing
- external identifiers
-
- wos:000318070100027
- scopus:84876938151
- ISSN
- 1361-648X
- DOI
- 10.1088/0953-8984/25/19/196005
- language
- English
- LU publication?
- yes
- id
- 5119c3ef-89ff-4a90-bbb2-77bb0e380940 (old id 3635954)
- date added to LUP
- 2016-04-01 13:40:30
- date last changed
- 2022-03-31 14:53:43
@article{5119c3ef-89ff-4a90-bbb2-77bb0e380940, 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.}}, author = {{Sadowski, Janusz and Jaroslaw Z, Domagala and Roland, Mathieu and Andras, Kovacs and Piotr, Dluzewski}}, issn = {{1361-648X}}, keywords = {{ferromagnetic semiconductors; magnetic nanocrystals; Molecular Beam Epitaxy}}, language = {{eng}}, number = {{19}}, pages = {{6--196005}}, publisher = {{IOP Publishing}}, series = {{Journal of Physics: Condensed Matter}}, title = {{Formation of two-dimensionally confined superparamagnetic (Mn, Ga)As nanocrystals in high-temperature annealed (Ga, Mn)As/GaAs superlattices}}, url = {{http://dx.doi.org/10.1088/0953-8984/25/19/196005}}, doi = {{10.1088/0953-8984/25/19/196005}}, volume = {{25}}, year = {{2013}}, }