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

Authors

• Y. Shao, University of Nebraska - Lincoln
• M.L. Yan, University of Nebraska - Lincoln
• David J. Sellmyer, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

May 2003

Comments

Published by American Institute of Physics. J. Applied Physics 93, 8152-8154 (2003). ©2003 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

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 M_s, perpendicular coercivity H_c, and remanence ratio M_r/M_s, were also dependent on the annealing temperature, annealing time and Ag content. Perpendicular H_c values increased from 1.5 to 15 kOe when the annealing temperature changed from 400 to 600 °C for 600 s. Perpendicular H_c 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.