Isotope-periodic multilayer method for short self-diffusion paths - A comparative neutron and synchrotron Mössbauer reflectometric study of FePd alloys

D. G. Merkel, Sz Sajti, Cs Fetzer, J. Major, M. Major, R. Rüffer, A. Rühm, S. Stankov, F. Tanczikó, L. Bottyn

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

FePt, FePd, CoPt, and CoPd in equilibrium exhibit the L10 structure with high perpendicular magnetic anisotropy making them attractive candidates for high-density magnetic recording. Magnetic properties of these films depend on the distribution and orientation of the L10 fraction controlled by diffusion on atomic scale. Epitaxial isotope-periodic natFePd/57FePd alloy films were prepared by molecular beam epitaxy and heat treated at 500°C for various retention times. Isotope-sensitive non-destructive methods, neutron reflectometry and synchrotron Mössbauer reflectometry were applied to follow very short diffusion paths normal to the film plane. Squared diffusion lengths and diffusion profiles were obtained from the fitting of experimental reflectivity curves for each annealing treatment steps. The somewhat different diffusion lengths obtained for the neutron and synchrotronMössbauer reflectograms of the same samples are explained by the larger footprint of the sample in the neutron experiment for which interface inhomogeneities are to be averaged. Diffusion in the microscopically different local environments were modelled by piecewise constant diffusion coefficients in the regions identified as different species by conversion electron Mössbauer spectroscopy.

Original languageEnglish
Article number012029
JournalJournal of Physics: Conference Series
Volume211
DOIs
Publication statusPublished - 2010

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synchrotrons
isotopes
neutrons
diffusion length
magnetic recording
footprints
electron spectroscopy
inhomogeneity
molecular beam epitaxy
diffusion coefficient
magnetic properties
reflectance
heat
anisotropy
annealing
curves
profiles

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Isotope-periodic multilayer method for short self-diffusion paths - A comparative neutron and synchrotron Mössbauer reflectometric study of FePd alloys. / Merkel, D. G.; Sajti, Sz; Fetzer, Cs; Major, J.; Major, M.; Rüffer, R.; Rühm, A.; Stankov, S.; Tanczikó, F.; Bottyn, L.

In: Journal of Physics: Conference Series, Vol. 211, 012029, 2010.

Research output: Contribution to journalArticle

Merkel, D. G. ; Sajti, Sz ; Fetzer, Cs ; Major, J. ; Major, M. ; Rüffer, R. ; Rühm, A. ; Stankov, S. ; Tanczikó, F. ; Bottyn, L. / Isotope-periodic multilayer method for short self-diffusion paths - A comparative neutron and synchrotron Mössbauer reflectometric study of FePd alloys. In: Journal of Physics: Conference Series. 2010 ; Vol. 211.
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abstract = "FePt, FePd, CoPt, and CoPd in equilibrium exhibit the L10 structure with high perpendicular magnetic anisotropy making them attractive candidates for high-density magnetic recording. Magnetic properties of these films depend on the distribution and orientation of the L10 fraction controlled by diffusion on atomic scale. Epitaxial isotope-periodic natFePd/57FePd alloy films were prepared by molecular beam epitaxy and heat treated at 500°C for various retention times. Isotope-sensitive non-destructive methods, neutron reflectometry and synchrotron M{\"o}ssbauer reflectometry were applied to follow very short diffusion paths normal to the film plane. Squared diffusion lengths and diffusion profiles were obtained from the fitting of experimental reflectivity curves for each annealing treatment steps. The somewhat different diffusion lengths obtained for the neutron and synchrotronM{\"o}ssbauer reflectograms of the same samples are explained by the larger footprint of the sample in the neutron experiment for which interface inhomogeneities are to be averaged. Diffusion in the microscopically different local environments were modelled by piecewise constant diffusion coefficients in the regions identified as different species by conversion electron M{\"o}ssbauer spectroscopy.",
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