Seedlayer and preheating effects on crystallography and recording performance of CoCrPtB perpendicular media

Author

Zheng, Min ; Choe, Geon ; Johnson, Kenneth E. ; Gao, Lan ; Liou, Sy-Hwang

Author_Institution

MMC Technol. Inc., San Jose, CA, USA

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

1979

Lastpage

1981

Abstract

The effects of seedlayer (SL) and preheating on the crystallographic, magnetic, and recording properties of CoCr₁₈Pt₁₆B₄ granular perpendicular magnetic media have been investigated. For the media with Ru as underlayer, although higher preheating improves both coercivity and squareness, the media is much noisier. With introducing Ta SL, Ru (0002)/Co (0002) crystallography is greatly enhanced. High coercivity, unity squareness, and negative nucleation field are achieved even at low preheating without degrading signal-to-noise ratio. In addition, the media is magnetically stable for a wide range of recording density.

Keywords

boron alloys; chromium alloys; cobalt alloys; coercive force; magnetic hysteresis; magnetic multilayers; magnetic recording noise; perpendicular magnetic recording; platinum alloys; sputtered coatings; thermal stability; CoCr₁₈Pt₁₆B₄ granular perpendicular magnetic media; CoCr₁₈Pt₁₆B₄-Ru-Ta; CoCrPtB perpendicular media; Ru underlayer; Ta seedlayer; coercivity; crystallography; magnetic properties; magnetic stability; media noise; negative nucleation field; preheating effects; recording performance; recording properties; seedlayer effects; signal-to-noise ratio; squareness; thermal stability; Coercive force; Crystallography; Magnetic properties; Magnetic recording; Perpendicular magnetic recording; Signal to noise ratio; Soft magnetic materials; Thermal degradation; Thermal stability; X-ray scattering;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.801792

Filename

1042064