Title: New phases and chemical short range order in co-deposited CoFe thin films with bcc structure: An NMR study
Authors: Wojcik, M ×
Jay, JP
Panissod, P
Jedryka, E
Dekoster, J
Langouche, Guido #
Issue Date: May-1997
Publisher: Springer verlag
Series Title: Zeitschrift fur physik b-condensed matter vol:103 issue:1 pages:5-12
Abstract: A Co-59 NMR study has been carried out on several series of co-evaporated Co1-xFex thin-film alloys prepared on MgO (001), GaAs (100), and GaAs (110) substrates at deposition temperatures between 175 degrees C and 500 degrees C. The sample thicknesses varied between 100 Angstrom and 1000 Angstrom and the alloy concentrations were in the range 0.1 < x < 0.3, X-ray diffraction and NMR show that the stability limits of the bcc phase in CoFe alloys is shifted from the x = 0.25 observed in the bulk alloys down to about x = 0.11 in thin films. For x = 0.27 and at the deposition temperature of 500 degrees C, a new ordered phase has been stabilised where Co has two Fe atoms only in its first coordination shell, Other samples, grown at lower temperatures, also exhibit an exotic chemical short range order (CSRO) where Co coordinations with zero and two Fe neighbours dominate. A mixture of bcc Co (and not fee Co as in the bulk alloys) and unknown ordered bcc intermetallics can account for the observed CSRO. Theoretical ground-state phases for the bcc lattice are considered in order to explain the observations.
ISSN: 0722-3277
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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