Fabrication of nonepitaxially grown double-layered FePt:C/FeCoNi thin films for perpendicular recording

Authors

M.L. Yan, University of Nebraska - Lincoln
Xingzhong Li, University of Nebraska-LincolnFollow
L. Gao, University of Nebraska - Lincoln
Sy_Hwang Liou, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow
R.J.M van de Veerdonk, Seagate Research, Pittsburgh, Pennsylvania
K.W. Wierman, Seagate Research, Pittsburgh, Pennsylvania

Date of this Version

10-20-2003

Comments

Published by American Institute of Physics.Appl. Phys. Lett, 83, 3332 (2003). ©2003 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

A noneptaxially grown double-layered thin-film medium of nanocompsite FePt:C with a FeCoNi soft underlayer for high-density perpendicular magnetic recording was fabricated and investigated. Square-shaped perpendicular loops with a remanance ratio nearly equal to one and a coercivity as large as 8.5 kOe were obtained for this ordered FePt:C double-layered medium. The formation of the ordered L1₀ phase is confirmed by electron diffraction experiments. Transmission electron microscope observations reveal that FePt grains with a uniform size less than 5 nm are embedded in the C matrix and appear to be well isolated. Our results show that nonepitaxially grown (001) textured double-layered nanocomposite L1₀ FePt-based films with perpendicular anisotropy are a promising candidate to realize extremely high-density perpendicular recording.