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Self-Diffusion in 57Fe/natFe Multilayers by In Situ Neutron Reflectometry

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Abstract

Time-of-flight in situ neutron reflectometry (i-NR) on Si/[57Fe(x nm)/natFe(x nm)]4/Pt with x = 4 and 8 nm multilayers during consecutive heat treatments at 423, 448, 473 and 498 K reveal an unexpected rearrangement of free volumes and an interface smoothening in the isotopic Fe multilayer below 473 K, before the regime of regular Bragg intensity decay starts. The bilayer period dependence of the diffusivities at around 500 K, however, does not follow predictions of Harrison’s theory for the C-type regime representing grain boundary diffusion.

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ACKNOWLEDGMENTS

This work is based upon experiments performed at the REFSANS instrument operated by Helmholtz-Zentrum Geesthacht (HZG) at the Heinz Maier-Leibnitz Zentrum (MLZ), Garching, Germany. Free beamtime for Proposal no. 11158 is gratefully acknowledged. Thanks to Gaetano Mangiapia of GEMS HZG for his help in experimental data organization.

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Authors and Affiliations

  1. Functional Nanostructures Research Group, Wigner Research Centre for Physics, 1525, Budapest, Hungary

    Szilárd Sajti & László Bottyán

  2. Neutron Scattering, Helmholtz-Zentrum Geesthacht Outstation at Heinz Maier-Leibnitz Zentrum, 85748, Garching, Germany

    Jean-François Moulin

  3. Technische Universität München, Physik Department E21, Lehrstuhl für Neutronenstreuung, 85748, Garching, Germany

    Amitesh Paul

  4. Guangdong Technion-Israel Institute of Technology, 515063, Guangdong, Shantou, China

    Amitesh Paul

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  1. Szilárd Sajti
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  2. László Bottyán
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  3. Jean-François Moulin
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  4. Amitesh Paul
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Correspondence to Amitesh Paul.

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Szilárd Sajti, Bottyán, L., Moulin, JF. et al. Self-Diffusion in 57Fe/natFe Multilayers by In Situ Neutron Reflectometry. J. Surf. Investig. 14 (Suppl 1), S1–S4 (2020). https://doi.org/10.1134/S1027451020070460

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  • DOI: https://doi.org/10.1134/S1027451020070460

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