Normal incidence polarization interferometry flying height testing

Author

Clegg, Warwick ; Liu, Xinqun ; Liu, Bo ; Li, Amei ; Chong, Chongtow ; Jenkins, David

Author_Institution

Centre for Res. in Inf. Storage Technol., Plymouth Univ., UK

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1941

Lastpage

1943

Abstract

In this paper, a dual-beam normal incidence polarization interferometer is presented to measure the flying height or head-disk spacing. It has the advantages of both the intensity interferometry method and the oblique incidence polarization interferometry method. With this polarization interferometer, not only can the flying height be measured down to contact without losing accuracy, but also the pitch and roll of the head-slider can be detected dynamically. The optical parameters of the head-slider can also be determined. Design details and experimental results are given

Keywords

disc drives; distance measurement; hard discs; light interferometers; light interferometry; light polarisation; dual-beam interferometer; flying height testing; head slider optical parameters; head-disk spacing; head-slider pitch; head-slider roll; normal incidence polarization interferometry; rigid disc design; Glass; Laser beams; Magnetic analysis; Memory; Optical interferometry; Optical polarization; Optical sensors; Performance evaluation; Testing; Time measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.951015

Filename

951015