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Core-shell nanostructure in a Ge_0.9Mn_0.1 film from structural and magnetic measurements

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arxiv 1405.4238 v1 pith:Q2S5ILEF submitted 2014-05-16 cond-mat.mes-hall

P. Dalmas de Reotier , E. Prestat , P. Bayle-Guillemaud , A. Barski , A. Marty , M. Jamet , A. Suter , T. Prokscha
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Z. Salman E. Morenzoni A. Yaouanc
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classification cond-mat.mes-hall
keywords bulkcombinedcoreselectronfilmmagneticmagnetizationmeasurements
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We have characterized a film of Ge_0.9Mn_0.1 forming self-organized nanocolumns perpendicular to the Ge substrate with high resolution scanning transmission electron microscopy combined with electron energy loss spectroscopy, and bulk magnetization and positive muon spin rotation and relaxation (muSR) measurements. The Mn-rich nanocolumns form a triangular lattice with no detectable Mn atoms in the matrix. They consist of cores surrounded by shells. The combined analysis of bulk magnetization and muSR data enables us to characterize the electronic and magnetic properties of both the cores and shells. The discovered phase separation of the columns between a core and a shell is probably relevant for other transition-metal doped semiconductors.

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