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MM: Fachverband Metall- und Materialphysik

MM 12: Poster I

MM 12.3: Poster

Montag, 27. März 2023, 18:15–20:00, P2/OG1+2

Nanoscale heat transport in heterostructures measured with UXRD at European XFEL — •Jan-Etienne Pudell^1,2,3, Marc Herzog², Max Mattern², Jasmin Jarecki², Alexander von Reppert², Ulrike Boesenberg¹, Angel Rodriguez-Fernandez¹, Wonhiuk Jo¹, Roman Shayduk¹, Wei Lu¹, Gregory Malinowski⁴, Michel Hehn⁴, Matias Bargheer^2,3, and Anders Madsen¹ — ¹European XFEL, Germany — ²Institut für Physik und Astronomie, Universität Potsdam, Germany — ³Helmholtz-Zentrum Berlin, Germany — ⁴Institut Jean Lamour, Université Lorraine, France

The transport of heat (or energy in general) in nanoscopic heterostructures is of great interest on a fundamental as well as a technological level, e.g. in the context of thermal management in devices or heat-assisted magnetic recording. In metal heterostructures, heat can be conducted by electrons that are in or out of equilibrium with lattice vibrations. Using ultrafast x-ray diffraction (UXRD), we investigate the influence of thin layers with high electron-phonon coupling on the thermal transport through a 100 nm Cu/Au layer sandwiched by thin Pt and Ni films on picosecond time scales after femtosecond laser excitation. The MID end-station at Europen XFEL is able to perform these time-resolved laser-pump x-ray-probe measurements to track the time dependence of the heat transport.

A time-dependent diffusive two temperature transport model reproduces our experimental data and thus verifies the efficient transport channel from the laser excited Pt-layer to the Ni-layer via hot electrons.