Magnetic properties and L1₀ phase formation of FePt films prepared by high current-density ion-beam irradiation and rapid thermal annealing methods

Authors

T. Yokota, University of Nebraska - Lincoln
M.L. Yan, University of Nebraska - Lincoln
Yinfan Xu, University of Nebraska - LincolnFollow
L. Gao, University of Nebraska - Lincoln
R. Zhang, University of Nebraska - LincolnFollow
LeighAnn Nicholl, University of Nebraska - LincolnFollow
Lu Yuan, Physics Department, University of NebraskaFollow
Ralph Skomski, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow
Sy_Hwang Liou, University of Nebraska-LincolnFollow
Chih-Huang Lai, National Tsing Hua University, Hsin-Chu, Taiwan
Cheng-Han Yang, National Tsing Hua University, Hsin-Chu, Taiwan
Sheng-Huang Huang, National Tsing Hua University, Hsin-Chu, Taiwan

Document Type

Article

Date of this Version

May 2005

Comments

Published by American Institute of Physics. J. Appl. Phys., 97, 10H306 (2005). ©2005 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

We investigated magnetic properties and L1₀ phase formation of FePt films by rapid thermal annealing (RTA) and high current-density ion-beam irradiation. The sample prepared by RTA at 550 °C has (001) texture and strong magnetic perpendicular anisotropy with H_c equal to 6 kOe. The sample irradiated at 5.04 µA/cm² has H_c equal to 10 kOe but has isotropic magnetic properties due to the (111) texture. The magnetic correlation length of the ion-irradiated sample was about twice as large as that of the RTA sample. This may be due to the inhomogeneity of the L1₀ phase formation in the ion-irradiated film.