Journal
MATERIALS
Volume 14, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/ma14112755
Keywords
electron-phonon coupling; time-resolved spectroscopy; nanoscale thermal transport
Categories
Funding
- National Research Foundation of Korea [2019R1C1C1009199, 2018M3D 1A1058793]
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In this study, the electron-phonon coupling (g) parameters of ferromagnetic 3d transition metal layers Fe and Co were investigated using time-domain thermoreflectance. The results indicate that these transition metals have similar g values, on the order of 10^18 W m(-3) K-1.
The electron-phonon coupling (g) parameter plays a critical role in the ultrafast transport of heat, charge, and spin in metallic materials. However, the exact determination of the g parameter is challenging because of the complicated process during the non-equilibrium state. In this study, we investigate the g parameters of ferromagnetic 3d transition metal (FM) layers, Fe and Co, using time-domain thermoreflectance. We measure a transient increase in temperature of Au in an FM/Au bilayer; the Au layer efficiently detects the strong heat flow during the non-equilibrium between electrons and phonons in FM. The g parameter of the FM is determined by analyzing the temperature dynamics using thermal circuit modeling. The determined g values are 8.8-9.4 x 10(17) W m(-3) K-1 for Fe and 9.6-12.2 x 10(17) W m(-3) K-1 for Co. Our results demonstrate that all 3d transition FMs have a similar g value, in the order of 10(18) W m(-3) K-1.
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