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Formation process a...
Formation process and superparamagnetic properties of (Mn,Ga)As nanocrystals in GaAs fabricated by annealing of (Ga,Mn)As layers with low Mn content
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- Sadowski, Janusz (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Domagala, Jaroslaw Z (author)
- Institute of Physics, Polish Academy of Sciences, Warszawa, Polen
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- Mathieu, Roland (author)
- Uppsala universitet,Fasta tillståndets fysik
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- Kovács, András (author)
- Center for Electron Nanoscopy, Technical University of Denmark, Kongens Lyngby, Danmark, and, Ernst Ruska-Centre and Peter Grünberg Institute, Research Centre Jülich, Tyskland
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- Kasama, Takeshi (author)
- Center for Electron Nanoscopy, Technical University of Denmark, Kongens Lyngby, Danmark
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- Dunin-Borkowski, Rafael E (author)
- Center for Electron Nanoscopy, Technical University of Denmark, Kongens Lyngby, Danmark, and, Ernst Ruska-Centre and Peter Grünberg Institute, Research Centre Jülich, Tyskland
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- Dietl, Tomasz (author)
- MAX-IV Laboratory, Lund University, and, Faculty of Physics, University of Warsaw, Polen
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(creator_code:org_t)
- 2011
- 2011
- English.
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In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 84:24, s. 245306-
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Abstract
Subject headings
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- X-ray diffraction, transmission electron microscopy, and magnetization measurements are employed to study the structural and magnetic properties of Mn-rich (Mn,Ga)As nanocrystals embedded in GaAs. These nanocomposites are obtained by moderate-temperature (400 degrees C) and high-temperature (560 degrees C and 630 degrees C) annealing of (Ga,Mn)As layers with Mn concentrations between 0.1% and 2%, grown by molecular beam epitaxy at 270 degrees C. Decomposition of (Ga,Mn)As is already observed at the lowest annealing temperature of 400 degrees C for layers with initial Mn content of 1% and 2%. Both cubic and hexagonal (Mn, Ga) As nanocrystals, with similar diameters of 7-10 nm, are observed to coexist in layers with an initial Mn content of 0.5% and 2% after higher-temperature annealing. Measurements of magnetization relaxation in the time span 0.1-10 000 s provide evidence for superparamagnetic properties of the (Mn,Ga)As nanocrystals, as well as for the absence of spin-glass dynamics. These findings point to weak coupling between nanocrystals even in layers with the highest nanocrystal density.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- TECHNOLOGY
- TEKNIKVETENSKAP
- Teknisk fysik med inriktning mot fasta tillståndets fysik
- Engineering Science with specialization in Solid State Physics
- molecular beam epitaxy
- nanomagnetism
- magnetic semiconductors
Publication and Content Type
- ref (subject category)
- art (subject category)
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