Voids and Mn-rich inclusions in a (Ga,Mn)As ferromagnetic semiconductor investigated by transmission electron microscopy

András Kovács, J Sadowski, Takeshi Kasama, J Domagala, R Mathieu, T Dietl, Rafal E. Dunin-Borkowski

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Voids adjacent to cubic (ZnS-type) and hexagonal (NiAs-type) Mn-rich nanocrystals are characterized using aberration-corrected transmission electron microscopy in an annealed Ga0.995Mn0.005As magnetic semiconductor specimen grown by molecular beam epitaxy. Nanobeam electron diffraction measurements suggest that the nanocrystals exhibit deviations in lattice parameter as compared to bulk MnAs. After annealing at 903 K, the magnetic transition temperature of the specimen is likely to be dominated by the presence of cubic ferromagnetic nanocrystals. In situ annealing inside the electron microscope is used to study the nucleation, coalescence, and grain growth of individual nanocrystals.
    Original languageEnglish
    JournalJournal of Applied Physics
    Volume109
    Pages (from-to)083546
    ISSN0021-8979
    DOIs
    Publication statusPublished - 2011

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