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Crystalline phase and orientation control of manganese nitride grown on MgO(001) by molecular beam epitaxy

J. Appl. Phys. 91, 1053 (2002); doi:10.1063/1.1425435

Issue Date: 1 February 2002

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Haiqiang Yang, Hamad Al-Brithen, Eugen Trifan, David C. Ingram, and Arthur R. Smith
Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701
The phase and orientation of manganese nitride grown on MgO(001) using molecular beam epitaxy are shown to be controllable by the manganese/nitrogen flux ratio as well as the substrate temperature. The most N-rich phase, theta phase (MnN), is obtained at very low Mn/N flux ratio. At increased Mn/N flux ratio, the next most N-rich phase, the eta phase (Mn3N2), is obtained having its c axis normal to the surface plane. Further increasing the Mn/N flux ratio, the eta phase (Mn3N2) having its c axis in the surface plane is obtained. Finally, the epsilon phase (Mn4N) is obtained at yet higher Mn/N flux ratio. The structural phase variation with Mn/N flux ratio is due to the kinetic control of the surface chemical composition, which determines the energetically most favorable phase. For a given Mn/N flux ratio, the phase is also found to be a function of the substrate temperature, with the less N-rich phase occurring at the higher substrate temperature. The change of phase with temperature is attributed to the change in the chemical composition resulting from the diffusion of N vacancies. Since the magnetic properties of MnxNy depend on the phase, the Mn/N flux ratio provides a way of directly controlling the magnetic properties. A phase diagram for molecular beam epitaxial growth is presented. ©2002 American Institute of Physics.
History: Received 19 July 2001; accepted 15 October 2001
Permalink: http://link.aip.org/link/?JAPIAU/91/1053/1
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KEYWORDS and PACS

Keywords
PACS
  • 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
  • 81.15.Hi
    Materials science Methods of deposition of films and coatings; film growth and epitaxy Molecular, atomic, ion, and chemical beam epitaxy
  • 75.50.Ee
    Magnetic properties and materials Studies of specific magnetic materials Antiferromagnetics
  • 75.70.Ak
    Magnetic properties and materials Magnetic properties of thin films, surfaces, and interfaces Magnetic properties of monolayers and thin films
  • 61.72.Ji
    Structure of solids and liquids; crystallography Defects and impurities in crystals; microstructure Point defects (vacancies, interstitials, color centers, etc.) and defect clusters
  • 64.70.-p
    Equations of state, phase equilibria, and phase transitions Specific phase transitions
  • YEAR: 2002

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ISSN:
0021-8979 (print)   1089-7550 (online)
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