High performance heads for perpendicular recording

Author

Zieren, V. ; Luitjens, S.B. ; Piena, M.J. ; de Bie, R.W. ; Schrauwen, C.P.G. ; Bernards, J.P.C.

Author_Institution

Philips Res. Lab., Eindhoven, Netherlands

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

2597

Lastpage

2602

Abstract

Several important features of past, present and future developments in the field of heads, specifically designed for perpendicular DL (double-layer) media, are outlined. The emphasis is probe heads (PHs) that are positioned on one side of the medium only. The fabrication and measurement of experimental, high-efficiency PHs, the so-called VSPs, are discussed. The experiments indicate that thin Co-Cr layers with a high coercivity are needed for a good short-wavelength response. This imposes several requirements on the pole material, such as a high saturation magnetization, low Barkhausen noise, and high permeability. A playback model is described that enables the head, medium, and interface parameters to be analyzed. The model has also been used to estimate the bit densities that can be obtained with PHs on DL media. An areal density of 1 bit/μm² appears feasible

Keywords

hard discs; magnetic heads; magnetic recording; video recording; areal density; bit densities; experiments; fabrication; features; high coercivity; high permeability; high saturation magnetization; interface parameters; low Barkhausen noise; magnetic recording; perpendicular double layer media; perpendicular recording; playback model; pole material; probe heads; requirements; short-wavelength response; thin Co-Cr layers; Coercive force; Fabrication; Magnetic analysis; Magnetic field measurement; Magnetic heads; Magnetic materials; Permeability; Perpendicular magnetic recording; Probes; Saturation magnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92185

Filename

92185