| Summary: | 碩士 === 國立中山大學 === 物理學系研究所 === 103 === Platinum thickness dependence and annealing effect of the longitudinal spin-Seebeck voltage has been investigated in platinum/ Ni79Fe21 films, which has grown on sapphire substrate.
In the experiment of thin film with different thickness, we found that the signal is negatively correlated with the Pt thickness before the thickness decreased into 9 nm.
Interestingly, we found the decreasing of the signal in the 5 nm thin film, which maybe caused by the weakening efficiency of inverse spin Hall effect that is correlated with the fact that the spin diffusion length is shorter than thicknesses of Pt.
On experiment of annealing, the signal is obviously decreased at 373 K, and the signal is nearly changeless with higher annealing temperature. After annealing, the indistinct interface appears due to the reaction between Permalloy and Platinum. The results indicate that there is no spin current into the Pt layer, and that only the anomalous Nernst effect in Permalloy remains.
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