Thin Film Non-Noble Transition Metal Thermophysical Properties
| Autor: | Andrew P. Caffrey, Patrick E. Hopkins, Pamela M. Norris, J. Michael Klopf |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Mechanical Engineering Materials Science (miscellaneous) chemistry.chemical_element Electron Condensed Matter Physics Laser Molecular physics Atomic and Molecular Physics and Optics law.invention Wavelength Thermal conductivity Transition metal chemistry Mechanics of Materials law Thermal General Materials Science Thin film Platinum |
| Zdroj: | Microscale Thermophysical Engineering. 9:365-377 |
| ISSN: | 1091-7640 1089-3954 |
| Popis: | The transient thermoreflectance (TTR) technique coupled with a pump-probe experimental setup enables the observation of thermal transport phenomena on a sub-picosecond time scale. The reflectance from non-noble transition metals (at least one unoccupied d-orbital in the conduction band) can be shown to have a linear dependence when compared to small changes in the electron and lattice temperatures. This thermal dependence can be combined with the parabolic two step (PTS) model to enable measurement of the electron-phonon coupling factor and thermal conductivity of thin film materials. Experimental results are presented for thin film samples of the non-noble transition metals platinum and nickel. Results are presented using laser wavelengths ranging from 740 nm to 805 nm and using a range of laser fluences (ranging from ∼0.35 to 2 J/m2). Over this range of wavelengths and fluences the material properties are shown to be independent of the measurement conditions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|