Pure nuclear Bragg reflection of a periodic 56Fe/57Fe multilayer

L. Deák, G. Bayreuther, L. Bottyán, E. Gerdau, J. Korecki, E. I. Kornilov, H. J. Lauter, O. Leupold, D. L. Nagy, A. V. Petrenko, V. V. Pasyuk-Lauter, H. Reuther, E. Richter, R. Röhloberger, E. Szilágyi

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Abstract

Grazing incidence nuclear multilayer diffraction of synchrotron radiation from a periodic stack of alternating 56Fe and 57Fe layers was observed. Resonant layer fraction, substrate size, flatness, and surface roughness limits were optimized by previous simulations. The isotopic multilayer (ML) sample of float glass/57Fe(2.25nm)/[56Fe(2.25nm)/ 57Fe(2.25nm)]×15/Al(9.0nm) nominal composition was prepared by molecular beam epitaxy at room temperature. Purity structure and lateral homogenity of the isotopic ML film was characterized by magnetometry, Auger electron, Rutherford backscattering, and conversion electron Mössbauer spectroscopies. The isotopic ML structure was investigated by neutron and synchrotron Mössbauer reflectometry. Surface roughness of about 1 nm of the flat substrate (curvature radius >57 m) was measured by scanning tunneling microscopy and profilometry. A pure nuclear Bragg peak appeared in synchrotron Mössbauer reflectometry at the angle expected from neutron reflectometry while no electronic Bragg peak was found at the same position by x-ray reflectometry. The measured width of the Bragg peak is in accordance with theoretical expectations.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Applied Physics
Volume85
Issue number1
DOIs
Publication statusPublished - Dec 1 1999

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Deák, L., Bayreuther, G., Bottyán, L., Gerdau, E., Korecki, J., Kornilov, E. I., Lauter, H. J., Leupold, O., Nagy, D. L., Petrenko, A. V., Pasyuk-Lauter, V. V., Reuther, H., Richter, E., Röhloberger, R., & Szilágyi, E. (1999). Pure nuclear Bragg reflection of a periodic 56Fe/57Fe multilayer. Journal of Applied Physics, 85(1), 1-7. https://doi.org/10.1063/1.369470