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 $\ensuremath{\sim}18$ $\mathrm{W}\phantom{\rule{0.16em}{0ex}}{\mathrm{m}}^{\ensuremath{-}1\phantom{\rule{0.16em}{0ex}}}{\mathrm{K}}^{\ensuremath{-}1}$ at remanence to $\ensuremath{\sim}32$ $\mathrm{W}\phantom{\rule{0.16em}{0ex}}{\mathrm{m}}^{\ensuremath{-}1\phantom{\rule{0.16em}{0ex}}}{\mathrm{K}}^{\ensuremath{-}1}$ 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.
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