Pulse shape, resolution, and signal-to-noise ratio in perpendicular recording

Author

Valcu, Bogdan ; Roscamp, Thomas ; Bertram, H. Neal

Author_Institution

Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA

Volume

38

Issue

1

fYear

2002

fDate

1/1/2002 12:00:00 AM

Firstpage

288

Lastpage

294

Abstract

The paper theoretically examines playback characteristics of a giant magnetoresistive (GMR) head for perpendicular recorded magnetization transitions with a soft underlayer. The magnetic scalar potential, calculated numerically by the finite-element method, is fitted to a simple formula involving geometry-dependent parameters. The reciprocity principle leads to the shape of the single pulse signal. For high permeability of the underlayer the pulse has an error function-type dependence on distance. Within this approximation, the paper derives simple formulas for the pulsewidth T₅₀, D₅₀, and transition-noise-limited signal-to-noise ratio

Keywords

finite element analysis; giant magnetoresistance; magnetic heads; magnetic recording noise; magnetoresistive devices; perpendicular magnetic recording; FEM; GMR head; error function-type dependence; finite-element method; geometry-dependent parameters; giant magnetoresistive head; high density magnetic recording; high permeability underlayer; magnetic scalar potential; perpendicular recorded magnetization transitions; perpendicular recording; playback characteristics; pulsewidth formula; reciprocity principle; signal-to-noise ratio; single pulse signal shape; soft underlayer; transition-noise-limited SNR; Finite element methods; Giant magnetoresistance; Magnetic heads; Magnetization; Permeability; Perpendicular magnetic recording; Pulse shaping methods; Shape; Signal resolution; Signal to noise ratio;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.990120

Filename

990120