Development of high resolution and low noise single-layered perpendicular recording media for high density recording

Author

Hirayama, Y. ; Futamoto, M. ; Ito, K. ; Honda, Y. ; Maruyama, Y.

Author_Institution

Central Res. Lab., Hitachi Ltd., Tokyo, Japan

Volume

33

Issue

1

fYear

1997

fDate

1/1/1997 12:00:00 AM

Firstpage

996

Lastpage

1001

Abstract

Single-layered perpendicular recording media with high resolution and low noise characteristics, which can be used for 10 Gb/in² level magnetic recording, have been developed. Noise characteristics of highly oriented CoCr₁₉Pt₁₀ media are improved, by employing CoCr₃₅/TiCr₁₀ dual-underlayer, by reducing magnetic crystal grain diameter, and by adding Ta to the magnetic layer. A linear recording density resolution (D₅₀) value of 260 kFCI and a S₀/N ratio of 36 dB are confirmed for the low noise 50-nm-thick CoCr₁₉Pt₁₀Ta₂ dual-underlayer medium using a flying MR head at magnetic spacing of 40 nm

Keywords

chromium alloys; cobalt alloys; digital magnetic recording; grain size; hard discs; magnetic multilayers; magnetic recording noise; perpendicular magnetic recording; platinum alloys; soft magnetic materials; tantalum alloys; 36 dB; 40 nm; 50 nm; CoCr₁₉Pt₁₀Ta₂ medium; CoCr₁₉Pt₁₀Ta₂-CoCr₃₅-TiCr₁₀; CoCr₃₅/TiCr₁₀ dual-underlayer; flying MR head; hard disc storage; high density recording; high resolution recording media; low noise characteristics; magnetic crystal grain diameter reduction; single-layered perpendicular recording media; Magnetic anisotropy; Magnetic heads; Magnetic noise; Magnetic recording; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Scanning electron microscopy; Sputtering; Substrates; Writing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.560145

Filename

560145