CEMS STUDY OF ULTRA-THIN FILMS OF FE-57 INTERFACED WITH NICKEL

Using conversion electron Mossbauer spectroscopy, we have studied the hyperfine field distributions of ultra-thin iron films interfaced on b oth sides with nickel. The configuration of the studied system was (Ni /Fe-57/Ni)(n) = (20 nm/X nm/20 nm)(n), with n = 3-7 and X = 0.5-1.5 nm . The films were grown at room temperature in high vacuum on (111) buf fer layers of nickel previously deposited on mica substrates at 300 de grees C. It has been found that the average hyperfine field is practic ally independent of the iron layer thickness, while this parameter str ongly affects the distribution profiles and the orientation of iron at om spins.