The effects of Sendust keeper thickness, Cr break-layer thickness and reproduce bias on keepered media performance and pulse asymmetry

Author

Lal, Brij ; Alex, Michael ; Sordello, Christopher ; Coughlin, Thomas M. ; Neuman, Thomas

Author_Institution

HMT Technol. Corp., Fremont, CA, USA

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3037

Lastpage

3039

Abstract

Keepered media optimal Sendust keeper thickness is 15 nm (2.06 memu/cm² MrT) in terms of amplitude, pulse width and peak detect channel performance. Keeper noise is partially coherent and is larger at low densities with minimum values for <15 nm keeper thickness. Performance improves as Cr break layer is reduced to 2.0 nm thickness. Keepered media amplitude and peak position asymmetry are a function of bias and must be corrected to do measurements of overwrite, partial erasure and NLTS and to achieve maximum linear storage density

Keywords

magnetic disc storage; magnetic recording noise; NLTS; Sendust; break-layer thickness; keeper thickness; keepered media performance; linear storage density; magnetic disk storage; overwrite; partial erasure; partially coherent noise; peak detect channel performance; peak position asymmetry; pulse asymmetry; pulse width; reproduce bias; Chromium; Cities and towns; Degradation; Density measurement; Disk recording; Magnetic heads; Magnetic memory; Magnetic recording; Position measurement; Signal to noise ratio; Soft magnetic materials; Space vector pulse width modulation;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.617836

Filename

617836