Journal
APPLIED PHYSICS LETTERS
Volume 120, Issue 9, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0080378
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Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [BA 2281/11-1 Project-No, 328545488 -TRR 227, 278162697-SFB 1242]
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By modeling and experiment, we study the ultrafast electronic transport of energy in a nanoscale Au/Fe hetero-structure and find that the high electron-phonon coupling and large Sommerfeld constant facilitate the transfer of energy from Au to Fe within a few hundreds of femtoseconds.
We study the ultrafast electronic transport of energy in a photoexcited nanoscale Au/Fe hetero-structure by modeling the spatiotemporal profile of energy densities that drives transient strain, which we quantify by femtosecond x-ray diffraction. This flow of energy is relevant for intrinsic demagnetization and ultrafast spin transport. We measured lattice strain for different Fe layer thicknesses ranging from few atomic layers to several nanometers and modeled the spatiotemporal flow of energy densities. The combination of a high electron-phonon coupling coefficient and a large Sommerfeld constant in Fe is found to yield electronic transfer of nearly all energy from Au to Fe within the first hundreds of femtoseconds.
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