Exchange Coupling Assisted FePtC Perpendicular Recording Media

Author

Hu, J.F. ; Chen, J.S. ; Ding, Y.F. ; Lim, B.C. ; Lwin, P.W. ; Liu, Bo

Author_Institution

Data Storage Inst., A*STAR, Singapore

Volume

44

Issue

11

fYear

2008

Firstpage

3547

Lastpage

3549

Abstract

Magnetic hard and soft phases FePtC thin films based exchange coupling assisted (ECA) perpendicular recording media were prepared. The coercivity of the FePtC film decreased after introducing a top magnetic soft FePtC layer. The cross-sectional transmission electron microscopy image illustrated that the soft FePt grains were located both on top of the bottom FePt grains and the grain boundaries, where the hard and soft grains were separated by a C layer accumulated on the hard FePtC layer surface. The reduction of coercivity was attributed to the exchange coupling between FePt hard and soft grains. For hard and soft grains separated by the accumulated C layer, the strength of the exchange coupling depended on the carbon layer thickness.

Keywords

carbon; chromium alloys; coercive force; exchange interactions (electron); grain boundaries; interface magnetism; iron alloys; magnesium compounds; magnetic thin films; perpendicular magnetic recording; platinum alloys; ruthenium alloys; transmission electron microscopy; CrRu-MgO-FePtC; carbon layer thickness; coercivity; cross-sectional transmission electron microscopy; exchange coupling; grain boundaries; magnetic hard thin films; magnetic soft layer; perpendicular recording media; $L1_{0}$ phase FePt; Exchange coupling assisted media; exchange spring media; perpendicular magnetic recording;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2008.2002536

Filename

4717477