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Optical conductivity of Ni1 − x
<0.25) from 0.76 to 6.6 eV
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Using spectroscopic ellipsometry and Drude-Lorentz oscillator fitting, we determined the dielectric function and optical conductivity versus photon energy from 0.76 to 6.6 eV of 10 nm thick Ni 1 − x Pt x alloy (0<x<0.25) films deposited on thick thermal oxides. We find absorption peaks near 1.6 and 5.0 eV due to interband optical transitions. There is a significant broadening of the UV peak with increasing Pt content, since the bandwidth of the 3d electrons in Ni is smaller than that of the 5d bands in Pt. Our experimental observation is consistent with ab initio calculations of the density of states for Ni, Pt, and the Ni 3Pt compound. Annealing the metals at 500°C for 30 s increases the optical conductivity.
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