Electronic energy transport in nanoscale Au/Fe hetero-structures in the perspective of ultrafast lattice dynamics
- 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.
| Author details: | Maximilian MatternORCiD, Alexander von ReppertORCiDGND, Steffen Peer ZeuschnerORCiDGND, Jan-Etienne PudellORCiDGND, F. Kühne, Detlef DiesingORCiD, Marc HerzogORCiDGND, Matias BargheerORCiDGND |
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| DOI: | https://doi.org/10.1063/5.0080378 |
| ISSN: | 0003-6951 |
| ISSN: | 1077-3118 |
| Title of parent work (English): | Applied physics letters |
| Publisher: | AIP Publishing |
| Place of publishing: | Melville |
| Publication type: | Article |
| Language: | English |
| Date of first publication: | 2022/02/28 |
| Publication year: | 2022 |
| Release date: | 2024/02/02 |
| Volume: | 120 |
| Issue: | 9 |
| Article number: | 092401 |
| Number of pages: | 5 |
| Funding institution: | Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [BA; 2281/11-1 Project-No, 328545488 -TRR 227, 278162697-SFB 1242] |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Peer review: | Referiert |
| License (German): |  Keine öffentliche Lizenz: Unter Urheberrechtsschutz |
