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Ge1-x Mnx Clusters: Central structural and magnetic building blocks of nanoscale wire-like self-assembly in a magnetic semiconductor

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Authors
Bougeard, D.
Sircar, N.
Ahlers, S.
Lang, V.
Abstreiten, G.
Trampert, A.
Lebeau, J.
Stemmer, S.
Saxey, David
Cerezo, A.
Date
2009
Type
Journal Article

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Bougeard, D. and Sircar, N. and Ahlers, S. and Lang, V. and Abstreiten, G. and Trampert, A. and Lebeau, J. et al. 2009. Ge1-x Mnx Clusters: Central structural and magnetic building blocks of nanoscale wire-like self-assembly in a magnetic semiconductor. Nano Letters: a journal dedicated to nanoscience and nanotechnology. 9 (11): pp. 3743-3748.
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Nano Letters: a journal dedicated to nanoscience and nanotechnology
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John de Laeter CoE in Mass Spectrometry
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Abstract

Controlled nanoscale self-assembly of magnetic entities in semiconductors opens novel perspectives for the tailoring of magnetic semiconductor films and nanostructures with room temperature functionality. We report that a strongly directional self-assembly in growth direction in Mn-alloyed Ge is due to a stacking of individual Ge1-x Mnx clusters. The clusters represent the relevant entitles for the magnetization of the material. They are formed of a core-shell structure displaying a Mn concentration gradient. While the magnetic moments seem to be carried by the shells of the clusters, their core is magnetically inactive. © 2009 American Chemical Society.