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Title: The effect of strain induced by Ag underlayer on saturation magnetization of partially ordered Fe{sub 16}N{sub 2} thin films

Partially ordered Fe-N thin films were grown by a facing target sputtering process on the surface of a (001) Ag underlayer on MgO substrates. It was confirmed by x-ray diffraction that the Ag layer enlarged the in-plane lattice of the Fe-N thin films. Domains of the ordered α″-Fe{sub 16}N{sub 2} phase within an epitaxial (001) α′-Fe{sub x}N phase were identified by electron diffraction and high-resolution aberration-corrected scanning transmission electron microscopy (STEM) methods. STEM dark-field and bright-field images showed the fully ordered structure of the α″-Fe{sub 16}N{sub 2} at the atomic column level. High saturation magnetization(Ms) of 1890 emu/cc was obtained for α″-Fe{sub 16}N{sub 2} on the Ag underlayer, while only 1500 emu/cc was measured for Fe-N on the Fe underlayer. The results are likely due to a tensile strain induced in the α″-Fe{sub 16}N{sub 2} phase by the Ag structure at the interface.
Authors:
 [1] ;  [2] ;  [3] ; ; ;  [4] ;  [1]
  1. Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083 (China)
  2. (MINT), University of Minnesota, 200 Union St SE, Minneapolis, Minnesota 55455 (United States)
  3. High Temperature Materials Laboratory, Materials Science and Technology Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831 (United States)
  4. Department of Electrical and Computer Engineering, The Center for Micromagnetics and Information Technologies (MINT), University of Minnesota, 200 Union St SE, Minneapolis, Minnesota 55455 (United States)
Publication Date:
OSTI Identifier:
22217753
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DEPOSITION; ELECTRON DIFFRACTION; EPITAXY; IMAGES; INTERFACES; IRON COMPOUNDS; LAYERS; MAGNESIUM OXIDES; MAGNETIZATION; RESOLUTION; SATURATION; SILVER; SPUTTERING; STRAINS; SUBSTRATES; SURFACES; THIN FILMS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION