Improvement of perpendicular magnetic properties by postannealing for M´-CoCrPt-M stacked media (M, M´=Ti, Ta, Ru, Pt, CrMn, MnSi)

Author

Saito, Shin ; Itagaki, Norikazu ; Takahashi, Migaku

Author_Institution

Dept. of Electron. Eng., Tohoku Univ., Sendai, Japan

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2467

Lastpage

2469

Abstract

In this paper, we discuss the effect of postannealing on magnetic properties and microstructure for CoCr-based perpendicular recording media. Material investigation for cap- and under-layers of the postannealed media is carried out, and significant improvement of magnetic properties is confirmed for the media with both titanium cap- and under-layers. This is caused by decoupling of magnetic exchange interaction among grains due to diffusion of Ti into the grain boundaries and by elimination of the nanocrystalline initial layer that behaves like a soft magnetic layer.

Keywords

annealing; exchange interactions (electron); grain boundaries; interface magnetism; perpendicular magnetic recording; soft magnetic materials; CoCr-based perpendicular media; CoCr-based perpendicular recording media; CrMn-CoCrPt-CrMn; CrMn-CoCrPt-MnSi; CrMn-CoCrPt-Pt; CrMn-CoCrPt-Ru; CrMn-CoCrPt-Ta; CrMn-CoCrPt-Ti; MnSi-CoCrPt-CrMn; MnSi-CoCrPt-MnSi; MnSi-CoCrPt-Pt; MnSi-CoCrPt-Ru; MnSi-CoCrPt-Ta; MnSi-CoCrPt-Ti; Pt-CoCrPt-CrMn; Pt-CoCrPt-MnSi; Pt-CoCrPt-Pt; Pt-CoCrPt-Ru; Pt-CoCrPt-Ta; Pt-CoCrPt-Ti; Ru-CoCrPt-CrMn; Ru-CoCrPt-MnSi; Ru-CoCrPt-Pt; Ru-CoCrPt-Ru; Ru-CoCrPt-Ta; Ru-CoCrPt-Ti; Ta-CoCrPt-CrMn; Ta-CoCrPt-MnSi; Ta-CoCrPt-Pt; Ta-CoCrPt-Ru; Ta-CoCrPt-Ta; Ta-CoCrPt-Ti; Ti-CoCrPt-CrMn; Ti-CoCrPt-MnSi; Ti-CoCrPt-Pt; Ti-CoCrPt-Ru; Ti-CoCrPt-Ta; Ti-CoCrPt-Ti; exchange coupling; grain boundaries; magnetic exchange interaction; microstructure properties; nanocrystalline initial layer; perpendicular magnetic properties; postannealed media; postannealing effect; soft magnetic layer; titanium cap-layers; titanium under-layers; Magnetic anisotropy; Magnetic materials; Magnetic properties; Microstructure; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Saturation magnetization; Soft magnetic materials; Sputtering; Titanium; CoCr-based perpendicular media; exchange coupling; postannealing; titanium;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.830160

Filename

1325540