PII: S0304-8853(98)01229-3 Copyright © 1999 Elsevier Science B.V. All rights reserved.
Phonon density of states in Fe/Cr(0 0 1) superlattices and Tb¯Fe thin-film alloys W. Sturhahna, R. Roehlsbergera, E. E. Alpa, T. Ruckertb, H. Schrörb and W. Keune, , b a Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USAb Laboratorium for Angewandte Physik, Universität Duisburg, D-47048 Duisburg, Germany Available online 7 January 2000.
W. Sturhahna, R. Roehlsbergera, E. E. Alpa, T. Ruckertb, H. Schrörb and W. Keune, , b
Inelastic nuclear scattering of X-rays from the 14.413 keV nuclear resonance of 57Fe was employed to measure directly the Fe-projected phonon density of states (DOS) in MBE-grown Fe/Cr(0 0 1) superlattices on MgO(0 0 1). The Mössbauer-inactive 56Fe isotope was used in the Fe layers. A 1 Å thick Mössbauer-active 57Fe-probe layer (95% enriched) was placed at different locations within the Fe layers. This procedure permits to distinguish phonon density of states at the Fe¯Cr-interface from that at the center of the Fe-film. Distinct differences have been observed in the DOS of our samples. The phonon DOS of an amorphous Tb33Fe67 alloy film was found to be a broad and structurless hump, contrary to that of an epitaxial TbFe2 film, which exhibits characteristic features.
Author Keywords: Phonon density of states; Inelastic nuclear resonance scattering; Superlattices; Alloy films
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Corresponding author. Tel.: +49203-379-2387; fax: +49203-379-3601; email: keune@uni-duisburg.de
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