Nanoscale protection for CoCrPt thin film magnetic recording media

Author

Zhang, J. ; Xu, Y.F. ; Wang, J.P. ; Pock, C.K. ; Ji, R. ; Chong, T.C.

Author_Institution

Data Storage Inst., Nat. Univ. of Singapore, Singapore

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1849

Lastpage

1851

Abstract

In this study, CrMn, CoCrPt-C multilayers and carbon overcoat were sequentially deposited on the NiAl coated glass substrate as underlayer, granular media layer, and protect layer by DC sputtering. Samples with various interlayer carbon concentration and top-layer carbon were tested for corrosion resistance in the 0.5 N HCl saturated vapor environment. The results show that surface concentration of cobalt and nickel varies with the carbon content in the magnetic layer. An nonannealed top-layer carbon and low temperature annealed interlayer carbon can provide grain-sized or nanoscale protection to the CoCrPt magnetic media. Carbon concentration within/above the top of CoCrPt-C granular thin film plays an important roles in the suppression of corrosion

Keywords

annealing; chromium alloys; cobalt alloys; corrosion protective coatings; magnetic recording; magnetic thin films; platinum alloys; sputtered coatings; CoCrPt thin film magnetic recording medium; CoCrPt-C; CoCrPt-C multilayer; CrMn; CrMn coating; DC sputtering; NiAl; NiAl underlayer; carbon overcoat; corrosion resistance; glass substrate; granular layer; low-temperature annealing; nanoscale protection; protective coating; surface concentration; Corrosion; Glass; Magnetic films; Magnetic multilayers; Magnetic recording; Protection; Saturation magnetization; Sputtering; Substrates; Testing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.950987

Filename

950987