A nonlinear model for magnetic recording channel with an MR head

Author

Sugawara, R. ; Uehara, Y. ; Oshima, T. ; Takagi, M. ; Shimoda, K. ; Mutoh, H.

Author_Institution

Fujitsu Labs. Ltd., Kawasaki, Japan

Volume

34

Issue

1

fYear

1998

fDate

1/1/1998 12:00:00 AM

Firstpage

57

Lastpage

62

Abstract

We propose a model for a magnetic recording channel to estimate the influences of the nonlinear distortion of an MR head on the performance of the PRML system, using a superposition of a magnetic field and a transfer curve obtained by a micro-magnetic model. A readback signal was simulated using a nonlinear model. The simulated signal was compared with an actual readback signal in the analysis of the isolated pulse, frequency response, and extracted dipulse response. We found that the nonlinear model represents actual MR head output satisfactorily, and that the performance of the PR4ML system was affected by the nonlinear distortion of the MR head for a 5% loss of the amplitude margin when the asymmetry was within 10%

Keywords

electric distortion; frequency response; magnetic heads; magnetoresistive devices; maximum likelihood estimation; partial response channels; MR head; PR4ML system; PRML system; amplitude margin; extracted dipulse response; frequency response; isolated pulse; magnetic recording channel; micro-magnetic model; nonlinear distortion; readback signal; transfer curve; Disk drives; Magnetic analysis; Magnetic field measurement; Magnetic fields; Magnetic heads; Magnetic recording; Magnetic shielding; Nonlinear distortion; Nonlinear equations; Saturation magnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.663442

Filename

663442