Indirect heating of Pt by short-pulse laser irradiation of Au in a nanoscale Pt/Au bilayer

Gyung Min Choi, R. B. Wilson, David G. Cahill

Research output: Contribution to journalArticle

Abstract

Thermal transport in a metallic multilayer on picosecond time scales is controlled by the electronic thermal conductivity (Λe), the electronic interfacial thermal conductance (Gee), and electron-phonon coupling constant (g). We analyze heat transfer in a nanoscale Pt/Au bilayer using data obtained in pump-probe measurements and modeling using a transmission-line-equivalent circuit. For optical exciation of either the Pt or Au side of the bilayer, the majority of energy is deposited into the Pt phonons on a time scale of ≈1 ps because gPtAu and Gee>gAuhAu, where hAu is the thickness of the Au layer. We determine g of the Au layer and set a lower bound on Gee of the Pt/Au interface: gAu = 2.2 ± 0.6 × 1016 W m-3 K-1 and Gee > 5 GW m-2 K-1.

Original languageEnglish (US)
Article number064307
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number6
DOIs
StatePublished - Feb 24 2014

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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