CEMS study of stainless steel films deposited by pulsed laser ablation of AISI316

Abstract

Thin stainless steel films deposited on SiO2/Si wafer were prepared by a pulsed laser ablation of austenite stainless steel (AISI316), and characterized by conversion electron Mossbauer spectrometry (CEMS) using a He gas proportional counter. As-deposited films were composed of a magnetic phase. When deposited films were heated in air at various temperatures, the hyperfine field of the magnetic phase increased. Hematite was produced on the surface, and the magnetic orientation changed from parallel to in-plane at random with the increase of heating temperatures. The metallic iron and magnetite were produced at 400°C in dry Ar + 5%H2 atmosphere. When the film was heated in wet Ar + 5%H2 atmosphere at 600°C, maghemite was produced on the surface, and austenite phase was produced in the inner film.