Effects of rapid thermal annealing on nanostructure, texture and magnetic properties of granular FePt:Ag films for perpendicular recording (invited)

摘要

We report effects of rapid thermal annealing on nanostructure, texture, and magnetic properties of granular FePt:Ag films. It was found that the orientations of FePt grains were dependent strongly on the as-deposited multilayer structure and the annealing processes. Through the control of the annealing processes, (001) textured L10 granular FePt:Ag films were obtained. Magnetic measurements revealed that saturation magnetization Ms, perpendicular coercivity Hc, and remanence ratio Mr/Ms, were also dependent on the annealing temperature, annealing time and Ag content. Perpendicular Hc values increased from 1.5 to 15 kOe when the annealing temperature changed from 400 to 600 °C for 600 s. Perpendicular Hc values remained about 11 kOe when the annealing time changed from 5 to 600 s. The effect of Ag content on magnetic properties is reported.