Overwrite in thin film disk recording systems

Author

Lin, Gang Herbert ; Zhao, Yang ; Bertram, H. Neal

Author_Institution

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

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

4215

Lastpage

4223

Abstract

Overwrite in thin film rigid disk recording is studied experimentally using disks with a wide range of magnetic moment and coercivity. Standard f₂/f₁ overwrite is investigated in detail at various recording currents and different flying heights. A theoretical model is developed using simple analytical approximations that relate demagnetization-field-induced position shift (hard transition shift) to the measured overwrite. The demagnetization fields due to the leading edge transitions are calculated analytically including a good approximation to the gapped head image. The results compare well with experimental measurements. A new overwrite measurement technique using the second harmonic component of a 0.5f₁, signal is also described

Keywords

demagnetisation; hard discs; magnetic fields; magnetic film stores; magnetic recording; magnetostatics; modelling; modulation; demagnetization fields; demagnetization-field-induced position shift; digital magnetic recording; flying heights; gapped head image; hard transition shift; leading edge transitions; magnetostatic field; modulation shift; overwrite measurement technique; rigid disk; second harmonic component; theoretical model; thin film disk recording systems; Coercive force; Demagnetization; Disk recording; Magnetic analysis; Magnetic field measurement; Magnetic films; Magnetic moments; Magnetic recording; Position measurement; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.280861

Filename

280861