Two-Dimensional Flying-Height Modulation Mapping at HDD Drive Level

Author

Shimizu, Yuki ; Xu, Junguo

Author_Institution

Central Res. Lab., Hitachi Ltd., Kanagawa

Volume

42

Issue

10

fYear

2006

Firstpage

2516

Lastpage

2518

Abstract

A measurement system for flying-height modulation of magnetic heads is proposed, and two-dimensional (2-D) flying-height modulation mapping is demonstrated at the drive level. The measurement system is based on the triple harmonic method, which uses a readback signal from the read element of the magnetic head. This technique, which maintains a constant wavelength of the pattern for fly-height modulation measurement, was proposed to achieve 2-D flying-height modulation mapping. Moreover, the frequency response of the measurement system was calibrated, and measurement accuracy was improved

Keywords

disc drives; frequency response; hard discs; harmonic analysis; magnetic heads; HDD drive level; flying-height modulation mapping; frequency response; head-disk interface; magnetic heads; magnetic recording; measurement system; triple harmonic method; Disk recording; Equations; Frequency measurement; Magnetic heads; Magnetic modulators; Magnetic recording; Signal processing; Thickness measurement; Two dimensional displays; Wavelength measurement; Flying height; head-disk interface (HDI); magnetic recording; measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.878630

Filename

1704350