A study of magnetic recording media on glass substrates

Author

Duan, Shanlin ; Zhang, Bing ; Gao, Chuan ; Rauch, Gary C. ; Pressesky, Jason L. ; Schwartz, Adam

Author_Institution

Seagate Magnetics, Fremont, CA, USA

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

3966

Lastpage

3968

Abstract

Magnetic media deposited on glass substrates with metal seedlayer, Cr underlayer and CoCrPtTa alloy were studied. Within each group of samples, although the bulk magnetic properties were made to be similar, the media noise differed significantly; microstructural study indicated that the grain sizes of the magnetic layers were similar. X-ray diffraction study indicated that the magnetic layer was mostly {10.0} textured, with some [00.2] and [10.1] oriented grains also present. A correlation was observed between stronger CoCrPtTa {00.2} diffraction peak and lower media noise; the Cr {200} peak in the lower noise media was also much weaker. The different crystallographic texture is likely promoted by the surface condition of the seedlayer; larger number of [00.2] grains within the mostly {10.0} textured magnetic layer may suppress the formation of large coherently-magnetized regions in the zig-zag transitions, which mould result in lower media noise

Keywords

X-ray diffraction; chromium; chromium alloys; cobalt alloys; coercive force; ferromagnetic materials; grain size; magnetic disc storage; magnetic recording noise; magnetic thin film devices; magnetic thin films; platinum alloys; tantalum alloys; CoCrPtTa-Cr; CoCrPtTa/Cr; X-ray diffraction; bulk magnetic properties; coherently-magnetized regions; crystallographic texture; glass substrates; grain sizes; magnetic disc storage; magnetic recording media; media noise; metal seedlayer; seedlayer surface condition; zig-zag transitions; Chromium; Coercive force; Glass; Magnetic films; Magnetic noise; Magnetic properties; Magnetic recording; Microstructure; Sputtering; Substrates;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.333959

Filename

333959