Spin-dependent thermal transport perpendicular to the planes of Co/Cu multilayers

Johannes Kimling, R. B. Wilson, Karsten Rott, Judith Kimling, Günter Reiss, David G. Cahill

Research output: Contribution to journalArticle

Abstract

We report measurements of the cross-plane thermal conductivity of periodic Co/Cu multilayers using time-domain thermoreflectance. The cross-plane thermal conductivity increases from ∼ 18 Wm-1K-1 at remanence to ∼ 32 Wm-1K-1 at saturation fields. This giant magnetothermal resistance (GMTR) effect is consistent with predictions based on the Wiedemann-Franz law. We discuss the role of a spin-dependent temperature, known as spin heat accumulation, in GMTR experiments and develop a three-temperature model capable of predicting the time evolution of the temperatures of majority-spin electrons, minority-spin electrons, and phonons subsequent to pulsed laser heating.

Original languageEnglish (US)
Article number144405
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number14
DOIs
StatePublished - Apr 7 2015

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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