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Formation process and superparamagnetic properties of (Mn,Ga)As nanocrystals in GaAs fabricated by annealing of (Ga,Mn)As layers with low Mn content
MAX-IV Laboratory, Lund University, Lund, and, Institute of Physics, Polish Academy of Sciences, Warszawa, Polen.
Institute of Physics, Polish Academy of Sciences, Warszawa, Polen.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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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2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 84, no 24, 245306- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2011. Vol. 84, no 24, 245306- p.
National Category
Condensed Matter Physics Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
URN: urn:nbn:se:uu:diva-164877DOI: 10.1103/PhysRevB.84.245306ISI: 000297934500005OAI: oai:DiVA.org:uu-164877DiVA: diva2:470543
Available from: 2011-12-29 Created: 2011-12-29 Last updated: 2016-04-20Bibliographically approved

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Publisher's full texthttp://link.aps.org/doi/10.1103/PhysRevB.84.245306

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