Time-resolved XAS of Fe/MgO heterostructure

ORAL

Abstract

A recent study of energy transfer due to laser excitation in a Fe/MgO heterostructure showed that the dynamic behavior is dominated by phonon-mediated processes [1]. We present an analysis of the spectral changes in the transient x-ray absorption spectra (XAS) using a finite-temperature real-space Green’s function approach. We approximate the phonon contribution via a harmonic dynamical matrix sampling method. Our theory accounts for the spectral differences shortly after laser excitation and at long times.

*Work at UW is supported by the DOE BES Grant DE-FG02-97ER45623.

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Presenters

  • Tun Sheng Tan

    • University of Washington

Authors

  • Tun Sheng Tan

    • University of Washington

  • Joshua Kas

    • University of Washington

  • Fernando Vila

    • University of Washington

  • John Rehr

    • University of Washington

  • Markus Gruner

    • Faculty of Physics, University of Duisburg-Essen
    • University of Duisburg-Essen

  • Andrea Eschenlohr

    • University of Duisburg-Essen

  • Uwe Bovensiepen

    • University of Duisburg-Essen

  • Carolin Schmitz-Antoniak

    • Jülich Research Center

  • Katharina Ollefs

    • University of Duisburg-Essen

  • Klaus Sokolowski-Tinten

    • University of Duisburg-Essen

  • Nico Rothenbach

    • University of Duisburg-Essen

  • Rossitza Pentcheva

    • University of Duisburg-Essen
    • Department of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
    • Faculty of Physics, University of Duisburg-Essen

  • Heiko Wende

    • University of Duisburg-Essen