Characterization of magnetizing process for pre-embossed servo pattern of plastic hard disks

Author

Tanaka, Shoji ; Imai, Yasuyuki ; Morita, Osamu ; Dericotte, David ; Kurokawa, Kotaro ; Kashiwagi, Toshiyuki ; Takino, Hiroshi

Author_Institution

Corp. Res. Labs., Sony Corp., Kanagawa, Japan

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4209

Lastpage

4211

Abstract

Rigid disks which have pre-embossed servo patterns have been developed. These media make it possible to follow tracks less than 5 μm pitch. The substrates are made from plastic; and pre-embossed servo patterns and discrete data tracks are made by a stamping technology similar to optical disks. To generate signals from pre-embossed servo patterns, the magnetization direction of the elevated pattern and recessed area must be opposing. Therefore, a two-step magnetization method has been developed. Based on experimental results, optimum conditions are met when the magnetization transition occurs at the upper edge of the patterns

Keywords

data recording; hard discs; magnetisation; plastics; servomechanisms; 5 micron; discrete data tracks; magnetization transition; plastic hard disks; pre-embossed servo pattern; rigid disks; two-step magnetization method; Clocks; Hard disks; Injection molding; Magnetic heads; Magnetization; Plastics; Production; Protection; Servomechanisms; Signal generators;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.334037

Filename

334037