SNR improvement of granular perpendicular recording media

Author

Zheng, M. ; Choe, G. ; Chekanov, A. ; Demczyk, B.G. ; Acharya, B.R. ; Johnson, K.E.

Author_Institution

MMC Technol. Inc., San Jose, CA, USA

Volume

39

Issue

4

fYear

2003

fDate

7/1/2003 12:00:00 AM

Firstpage

1919

Lastpage

1924

Abstract

In this paper, we address important issues on the performance improvement of perpendicular magnetic recording (PMR) media, such as noise reduction by adjusting the soft magnetic underlayer (SUL) properties and recording layer and intermediate layer modifications for optimum signal-to-noise (SNR) performance. The permeability of the SUL plays a significant role in writability and SNR. Proper pinning of the SUL should be considered for reducing spike noise. A systematic comparison of alloy and oxide granular media shows that optimized oxide media can provide both better SNR and good thermal stability and is promising for high-density recording.

Keywords

granular materials; magnetic permeability; magnetic recording noise; perpendicular magnetic recording; soft magnetic materials; thermal stability; SNR improvement; SUL permeability; SUL pinning; alloy media; granular perpendicular recording media; high-density recording; intermediate layer modifications; magnetic recording media; noise reduction; optimum SNR performance; optimum signal-to-noise; oxide granular media; recording layer modifications; soft magnetic underlayer properties; spike noise reduction; thermal stability; writability; Disk recording; Magnetic heads; Magnetic recording; Noise reduction; Nonhomogeneous media; Permeability; Perpendicular magnetic recording; Signal to noise ratio; Soft magnetic materials; Thermal stability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.813777

Filename

1211159