Low-noise CoCrPtO perpendicular media with improved resolution

Author

Velu, E.M.T. ; Malhotra, Sudhir ; Bertero, Gerardo ; Wachenschwanz, David

Author_Institution

Komag Inc., San Jose, CA, USA

Volume

39

Issue

2

fYear

2003

fDate

3/1/2003 12:00:00 AM

Firstpage

668

Lastpage

672

Abstract

CoCrPtO perpendicular media with coercivities greater than 6000 Oe, M_r/M_s equal to 1.0, and negative nucleation fields exceeding 3000 Oe were produced. The crystallographic, magnetic, and recording properties were optimized with respect to Ru interlayer and CoTaZr soft-underlayer thicknesses. Media with exchange decoupled magnetic grains as small as 7 nm with a narrow size distribution capable of supporting a linear density up to 720 kfci were produced. Thermal decay measured at 50 kfci at ambient temperature was less than 0.1%.

Keywords

chromium alloys; cobalt alloys; coercive force; crystal microstructure; grain size; magnetic hysteresis; magnetic multilayers; magnetic recording noise; magnetic thin films; perpendicular magnetic recording; platinum alloys; storage media; thermal stability; 7 nm; CoCrPtO perpendicular media; CoCrPtO-Ru-CoTaZr; CoTaZr soft-underlayer thickness; Ru interlayer thickness; crystallographic properties; double-layer perpendicular media; exchange decoupled magnetic grains; high-coercivity media; low-noise perpendicular media; magnetic properties; negative nucleation fields; recording properties; thermal decay; Coercive force; Magnetic films; Magnetic heads; Magnetic hysteresis; Magnetic properties; Magnetometers; Perpendicular magnetic recording; Signal to noise ratio; Soft magnetic materials; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.808991

Filename

1190082