Diffuse x-ray scattering from inclusions in ferromagnetic Ge1xMnx layers

V. Holý, R. T. Lechner, S. Ahlers, L. Horák, T. H. Metzger, A. Navarro-Quezada, A. Trampert, D. Bougeard, and G. Bauer
Phys. Rev. B 78, 144401 – Published 2 October 2008

Abstract

Magnetic properties of Ge1xMnx epitaxial layers with a Mn content of a few percents are substantially influenced by inhomogeneities in the distribution of Mn atoms in the Ge lattice. Depending on the substrate temperature during molecular-beam epitaxial fabrication, apparently cubic, coherent Mn-rich clusters or incoherent precipitates consisting of the hexagonal, intermetallic Mn5Ge3 phase can occur in a defect free, diamond lattice Ge matrix. In this work, we apply synchrotron x-ray diffraction in grazing-incidence geometry to probe the diffuse scattered intensity of the distorted Ge host lattice. Based on a theoretical description of the scattered intensity we derive quantitative information on the lattice mismatch between the Mn inclusions and the Ge lattice, as well as on the average size of the inclusions and the average Mn content within the inclusions.

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  • Received 29 May 2008

DOI:https://doi.org/10.1103/PhysRevB.78.144401

©2008 American Physical Society

Authors & Affiliations

V. Holý1, R. T. Lechner2, S. Ahlers3, L. Horák1, T. H. Metzger4, A. Navarro-Quezada2, A. Trampert5, D. Bougeard3, and G. Bauer2

  • 1Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague, Czech Republic
  • 2Institut für Halbleiter- und Festkörperphysik, Johannes Kepler Universität Linz, 4040 Linz, Austria
  • 3Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, D-85748 Garching, Germany
  • 4ESRF, 6 rue Jules Horowitz, B.P. 220, F-38043 Grenoble Cedex, France
  • 5P. Drude Institut für Festkörperelektronik, Hausvogteipl. 5-7, D-10117 Berlin, Germany

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Issue

Vol. 78, Iss. 14 — 1 October 2008

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