THE OPTICAL-PROPERTIES OF MANGANESE THIN-FILMS

The optical constants n and k of thin manganese films of different thicknesses ranging from 20 up to 50 nm were determined in the spectral range 3.5-20 mu m. The results were compared with the predictions of the Drude free electron theory and anomalous skin effect theory. The previous theories were used to evaluate some micro characteristics of Mn thin films such as the free charge concentration N, the relaxation time tau, the static conductivity sigma(s), and the electron velocity at Fermi surface V-F and the value of the effective area of Fermi surface A(F). Using the optical constants, the optical conductivity (sigma = sigma(1) + i sigma(2)) was also estimated. It was found that the contribution of the effective absorption A(eff) equals 69%, i.e. the absorption due to bound electrons may be 31%.