Low noise performance of CoCrPt single-layer perpendicular magnetic recording media

Author

Hirayama, Yoshiyuki ; Kikukawa, Atsushi ; Honda, Yukio ; Shimizu, Noboru ; Futamoto, Masaaki

Author_Institution

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

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

2396

Lastpage

2398

Abstract

Magnetic and noise characteristics of CoCrPt single-layer perpendicular recording media prepared by high-rate deposition process have been investigated. The medium noise was reduced by high-rate deposition, however the inter-diffusion between the CoCr₁₉Pt ₁₀ magnetic layer and a TiCr₁₀ underlayer was observed at the interface. The magnetic properties were improved by introducing a CoCrRu underlayer between the CoCrPt and the TiCr layers. Addition of 2-nm-thick MgO layer between the CoCrRu and the TiCr layers was found to be useful to increase the coercivity and to reduce the medium noise

Keywords

chemical interdiffusion; chromium alloys; cobalt alloys; coercive force; perpendicular magnetic recording; platinum alloys; CoCr₁₉Pt₁₀; CoCr₁₉Pt₁₀ magnetic layer; CoCrPt; CoCrPt single-layer perpendicular magnetic recording media; CoCrRu; CoCrRu underlayer; MgO; MgO layer; TiCr₁₀; TiCr₁₀ underlayer; coercivity; high-rate deposition process; inter-diffusion; low noise performance; magnetic characteristics; magnetic properties; medium noise; noise characteristics; Coercive force; Magnetic films; Magnetic heads; Magnetic materials; Magnetic noise; Magnetic properties; Magnetic recording; Noise reduction; Perpendicular magnetic recording; Sputtering;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908444

Filename

908444