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

P. Dalmas de Reotier; E. Prestat; P. Bayle-Guillemaud; A. Barski; A. Marty; M. Jamet; A. Suter; T. Prokscha; Z. Salman; E. Morenzoni; A. Yaouanc

doi:10.1103/PhysRevB.91.245408

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

Mesoscale and Nanoscale Physics 2015-06-17 v1

Authors: P. Dalmas de Reotier , E. Prestat , P. Bayle-Guillemaud , A. Barski , A. Marty , M. Jamet , A. Suter , T. Prokscha , Z. Salman , E. Morenzoni , A. Yaouanc

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Abstract

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.

Keywords

core-shell nanostructure GeMn film self-organized nanocolumns magnetic properties muon spin rotation phase separation transition-metal doped semiconductors

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@article{arxiv.1405.4238,
  title  = {Core-shell nanostructure in a Ge_0.9Mn_0.1 film from structural and magnetic measurements},
  author = {P. Dalmas de Reotier and E. Prestat and P. Bayle-Guillemaud and A. Barski and A. Marty and M. Jamet and A. Suter and T. Prokscha and Z. Salman and E. Morenzoni and A. Yaouanc},
  journal= {arXiv preprint arXiv:1405.4238},
  year   = {2015}
}

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5 pages, 5 figures, and supplemental material

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

Abstract

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