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Hyperfine Interactions

, Volume 53, Issue 1, pp 143-158

First online:

Mössbauer spectra and electronic structure of nonequilibrium Fe-Cu alloys produced by vapor quenching

  • Kenji SumiyamaAffiliated withDepartment of Metal Science and Technology, Kyoto University
  • , Yoji NakamuraAffiliated withDepartment of Metal Science and Technology, Kyoto University
  • , Kazuhide TanakaAffiliated withDepartment of Materials Science and Engineering, Nagoya Institute of Technology

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Abstract

Mössbauer spectra have been observed for nonequilibrium bcc and fcc Fe−Cu alloys sputter-deposited at several Ar gas pressures,P Ar. These alloys are ferromagnetic at low temperatures and show sextet spectra. The fcc alloys which are paramagnetic at 290 K show asymmetric doublet spectra, indicating no serious segregation. In the alloys deposited at highP Ar, the weak intensity ratios of the second and fifth lines of the sextet indicate a tendency of perpendicular magnetic anisotropy, while a large magnetic hyperfine field component of about 40 MA/m (500 kOe) at 4.2 K and a large quadrupole splitting component of about 0.7 mm/s at 290 K imply CuFeO2 formation. The nonequilibrium, bcc and fcc Fe−Cu, alloys are maintained below 500 K and the phase separation is detected above 550 K. X-ray photoemission spectroscopy studies of these alloys reveals individual Fe- and Cu-d bands. The concentration dependence of peak intensities and peak positions indicate that Fe and Cu electronically intermix.