Gb. Fratucello et Am. Prandini, PROPERTIES OF THE NI FE INTERFACE IN NI/FE/NI MULTILAYERS/, Journal of electron spectroscopy and related phenomena, 76, 1995, pp. 665-669
Thin multilayer samples of Fe/Ni were investigated by Mossbauer spectr
oscopy at room temperature. Iron films up to 17 Angstrom were found in
gamma phase; alpha phase showed up at higher coverage. The gamma inte
rface is characterized by an enhanced hyperfine field with respect to
bulk, while the alpha interface shows a lowered hyperfine field. Inter
diffusion was observed after annealing close to 200 degrees C and was
interpreted in terms of minimization of strain energy.