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Mössbauer spectroscopy investigation of body centered cubic Co in Co/Fe superlattices prepared with MBE

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Abstract

A new spectrum component is observed in Mössbauer spectra of thin body centered cubic Co layers prepared in Fe/Co superlattices doped with57Co. It is characterized by a large magnetic hyperfine field (31.2 T) and an isomer shift nearly equal to that of α-Fe. The decrease of the isomer shift in bcc Co with respect to hcp Co is consistent with smaller s to d charge transfer in bcc Co as compared to hcp Co. The cubic structure of the CoFe superlattices is evidenced with X-ray diffraction and ion-channeling measurements. The Fe/Co interface is investigated with conversion electron Mössbauer spectroscopy. It is shown that the interface alloy thickness is about six monolayers for growth temperatures up to 450 K and that increasing alloying occurs for higher growth temperatures.

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Author notes

  1. H. Bemelmans

    Present address: IMEC, Kapeldreef 75, B-3001, Leuven, Belgium

Authors and Affiliations

  1. Instituut voor Kent-en Stralingsfysica, KULeuven, Celestijnenlaan 200D, B-3001, Leuven, Belgium

    J. Dekoster, H. Bemelmans, S. Degroote (Research Assistent), J. De Wächter, R. Moons, A. Vantomme & G. Langouche

  2. Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, PL-02668, Warsaw, Poland

    E. Jedryka

  3. NFWO (National Fund for Scientific Research, Belgium), Belgium

    S. Degroote (Research Assistent)

Authors
  1. J. Dekoster
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  2. H. Bemelmans
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  3. S. Degroote
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  4. J. De Wächter
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  5. E. Jedryka
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  6. R. Moons
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  7. A. Vantomme
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  8. G. Langouche
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Dekoster, J., Bemelmans, H., Degroote, S. et al. Mössbauer spectroscopy investigation of body centered cubic Co in Co/Fe superlattices prepared with MBE. Hyperfine Interact 95, 191–198 (1995). https://doi.org/10.1007/BF02146314

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  • DOI: https://doi.org/10.1007/BF02146314

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