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arxiv cond-mat/0611245 v1 pith:NTWTSTEN submitted 2006-11-09 cond-mat.mtrl-sci cond-mat.other

Clustering in a precipitate free GeMn magnetic semiconductor

D. Bougeard , S. Ahlers , A. Trampert , N. Sircar , G. Abstreiter This is my paper
classification cond-mat.mtrl-sci cond-mat.other
keywords magnetisationclusterscontentfilmsfreeprecipitateanalysisareas
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present the first study relating structural parameters of precipitate free Ge0.95Mn0.05 films to magnetisation data. Nanometer sized clusters - areas with increased Mn content on substitutional lattice sites compared to the host matrix - are detected in transmission electron microscopy (TEM) analysis. The films show no overall spontaneous magnetisation at all down to 2K. The TEM and magnetisation results are interpreted in terms of an assembly of superparamagnetic moments developing in the dense distribution of clusters. Each cluster individually turns ferromagnetic below an ordering temperature which depends on its volume and Mn content.

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