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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session I
MM 18.39: Poster
Montag, 16. März 2020, 18:15–20:00, P4
Nanoscale heat transport in heterostructures — •Jan-Etienne Pudell1, Marc Herzog1, Alexander von Reppert1, Gregory Malinowski3, Matthias Rössle2, and Matias Bargheer1,2 — 1Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany — 2Helmholtz-Zentrum Berlin, Berlin, Germany — 3Institut Jean Lamour, Université Lorraine, Nancy, 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, which are in- or out-of-equilibrium with lattice vibrations. Using time-resolved x-ray diffraction, we investigate the thermal transport through a 100 nm Cu layer sandwiched by thin Pt and Ni films on a glass substrate on picosecond time scales after femtosecond laser excitation. A time-dependent diffusive transport model accurately reproduces our experimental data and thus verifies the efficient transport channel from the laser excited Pt-layer to the Ni-layer via hot electrons. The results imply dominant diffusive instead of ballistic electron transport.