Thermal conductance of interfaces with amorphous SiO2 measured by time-resolved magneto-optic Kerr-effect thermometry

Judith Kimling, André Philippi-Kobs, Jonathan Jacobsohn, Hans Peter Oepen, David G Cahill

Research output: Contribution to journalArticle

Abstract

We use time-resolved magneto-optic Kerr effect and ultrathin Co/Pt transducer films to perform thermal-transport experiments with higher sensitivity and greater time resolution than typically available in studies of interfacial thermal transport by time-domain thermoreflectance. We measure the interface conductance between Pt and amorphous SiO2 using Pt/Co/Pt ferromagnetic transducer films with thicknesses between 4.2 and 8.2 nm and find an average value of GPt≈0.3GWm-2K-1. This result demonstrates that interfaces between metals and amorphous dielectrics can have a conductance corresponding to Kapitza lengths of the order of 4 nm, and are thus of relevance when engineering nanoscale devices. For thin SiO2 layers, our method also provides sensitivity to the interface conductance between SiO2 and Si and we find GSi=0.6GWm-2K-1 as the lower limit.

Original languageEnglish (US)
Article number184305
JournalPhysical Review B
Volume95
Issue number18
DOIs
StatePublished - May 22 2017

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Magnetooptical effects
magneto-optics
Kerr effects
temperature measurement
Transducers
transducers
Metals
sensitivity
engineering
Experiments
metals
Hot Temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Thermal conductance of interfaces with amorphous SiO2 measured by time-resolved magneto-optic Kerr-effect thermometry. / Kimling, Judith; Philippi-Kobs, André; Jacobsohn, Jonathan; Oepen, Hans Peter; Cahill, David G.

In: Physical Review B, Vol. 95, No. 18, 184305, 22.05.2017.

Research output: Contribution to journalArticle

Kimling, Judith ; Philippi-Kobs, André ; Jacobsohn, Jonathan ; Oepen, Hans Peter ; Cahill, David G. / Thermal conductance of interfaces with amorphous SiO2 measured by time-resolved magneto-optic Kerr-effect thermometry. In: Physical Review B. 2017 ; Vol. 95, No. 18.
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