THE OPTICAL-PROPERTIES OF MANGANESE THIN-FILMS

The optical constants n and k of thin manganese films of different thi cknesses ranging from 20 up to 50 nm were determined in the spectral r ange 3.5-20 mu m. The results were compared with the predictions of th e Drude free electron theory and anomalous skin effect theory. The pre vious theories were used to evaluate some micro characteristics of Mn thin films such as the free charge concentration N, the relaxation tim e 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 contr ibution of the effective absorption A(eff) equals 69%, i.e. the absorp tion due to bound electrons may be 31%.