The effects of MR induced non-linearities on channel performance

Author

Chopra, Kiran ; Nix, Lamar ; Taberski, Kevin D.

Author_Institution

Rocky Mountain Magnetics Inc., Louisville, CO, USA

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4200

Lastpage

4202

Abstract

High performance disk files of today are utilizing magnetoresistive (MR) heads to realize significant improvements in areal density. The MR head is a non-linear device which can at best be operated in a quasi-linear mode. The effect of MR induced non-linearities on the recording channel performance is not widely understood. The partial response channel is known to be sensitive to write non-linearities. In this paper we study the effects of read process non-linearities. We present the results of a combined recording process and channel model to quantify the signal margin reduction of the peak detect channel and the PR4 channel, as a function of various MR induced non-linearities. We find that the traditional measure of MR peak asymmetry is inadequate to predict channel performance

Keywords

magnetic disc storage; magnetic heads; magnetoresistive devices; MR peak asymmetry; PR4 channel; areal density; high performance disk files; magnetoresistive heads; nonlinear device; partial response channel; peak detect channel; quasilinear mode; read process nonlinearities; recording channel performance; Acceleration; Disk recording; Intersymbol interference; Linearity; Magnetic heads; Magnetic recording; Magnetic sensors; Magnetoresistance; Partial response channels; Signal processing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.334034

Filename

334034