A self-consistent model for overwrite modulation in thin film recording media

Author

Roscamp, Thomas A. ; Curland, Nathan

Author_Institution

Rosecamp Eng., San Diego, CA, USA

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

3090

Lastpage

3092

Abstract

Overwrite modulation is studied by using self-consistent iterations to calculate the written transition region as a function of the DC erased state of the medium. These written transitions are then superimposed for (2,7)-code overwrite test conditions, and Fourier series analysis is used to calculate overwrite. It is found that overwrite can be attributed to timing modulation due to the shifts in the locations of the transitions and to amplitude modulation due to different head field gradients (modified by demagnetizing fields) at the different transition locations. Image charges are found to have significant effect on the calculated results. Comparison is made with experimental data

Keywords

magnetic recording; magnetic thin film devices; modulation; series (mathematics); (2,7)-code overwrite test conditions; DC erased state; Fourier series analysis; amplitude modulation; demagnetizing fields; head field gradients; image charges; overwrite modulation; self-consistent model; thin film recording media; timing modulation; transition locations; written transition region; Amplitude modulation; Data engineering; Demagnetization; Fourier series; Frequency; Head; Production; Switches; Testing; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92344

Filename

92344