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Studies of Mn/GaAs digital alloys using x-ray absorption fine structure and x-ray diffraction methods

Appl. Phys. Lett. 80, 2654 (2002); doi:10.1063/1.1467982

Issue Date: 15 April 2002

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Y. L. Soo, G. Kioseoglou, S. Kim, X. Chen, H. Luo, and Y. H. Kao
Department of Physics, State University of New York at Buffalo, Buffalo, New York 14260

Y. Sasaki, X. Liu, and J. K. Furdyna
Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
Local structure and effective chemical valency of Mn atoms in Mn/GaAs digital alloys have been investigated using the x-ray absorption fine structure techniques. The samples were prepared by molecular-beam epitaxy with different thickness of GaAs layers separating the nominal Mn monolayers. Lattice constants of the digital alloys are found by x-ray diffraction to increase linearly in a very narrow range (about 0.3%) with the Mn/GaAs ratio in the samples. Our data show that Mn atoms in the nominal Mn monolayers actually combine with GaAs to form (Ga, Mn)As alloys with Mn atoms substituting for the Ga sites in GaAs. This result clearly rules out the possibility of dominant MnAs formation. ©2002 American Institute of Physics.
History: Received 15 August 2001; accepted 8 February 2002
Permalink: http://link.aip.org/link/?APPLAB/80/2654/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.35.Ct
    Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties) Solid surfaces and solid-solid interfaces: Structure and energetics Interface structure and roughness
  • 68.35.Fx
    Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties) Solid surfaces and solid-solid interfaces: Structure and energetics Diffusion; interface formation
  • 68.35.Dv
    Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties) Solid surfaces and solid-solid interfaces: Structure and energetics Composition, segregation; defects and impurities
  • 78.70.Dm
    Optical properties, condensed-matter spectroscopy and other interactions of radiation and particles with condensed matter Interactions of particles and radiation with matter X-ray absorption spectra
  • 75.70.Ak
    Magnetic properties and materials Magnetic properties of thin films, surfaces, and interfaces Magnetic properties of monolayers and thin films
  • 75.50.Pp
    Magnetic properties and materials Studies of specific magnetic materials Magnetic semiconductors
  • 75.50.Dd
    Magnetic properties and materials Studies of specific magnetic materials Nonmetallic ferromagnetic materials
  • 68.55.Jk
    Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties) Thin film structure and morphology Structure and morphology; thickness; crystalline orientation and texture
  • 68.55.Nq
    Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties) Thin film structure and morphology Composition and phase identification
  • 81.15.Hi
    Materials science Methods of deposition of films and coatings; film growth and epitaxy Molecular, atomic, ion, and chemical beam epitaxy
  • 61.46.+w
    Structure of solids and liquids; crystallography Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
  • YEAR: 2002

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ISSN:
0003-6951 (print)   1077-3118 (online)
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