Pole Tip Recession (PTR) measurements with high accuracy, precision, and throughput

Author

Kulkarni, Ashok V. ; Chilamakuri, Sameera K. ; Gupta, B.K. ; Menon, Aric

Author_Institution

Read-Rite Corp., Fremont, CA, USA

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

2736

Lastpage

2738

Abstract

Accurate and precise Pole Tip Recession (PTR) measurement is vital to meet the magnetic spacing requirement and to achieve higher electrical test yield at the Head-Gimbel Assembly (HGA). To obtain a high throughput in PTR measurements, optical interferometers are the most commonly used techniques. PTR values determined by optical tools will however need to be corrected for material dissimilarities and the roughness effects. The correction factor or “PTR offset” values are influenced by variations in the optical properties of the pole tip and ABS surfaces. The changes in PTR offsets values due to variation in slider surface roughness and overcoat properties is the subject of this paper

Keywords

height measurement; light interferometry; magnetic heads; correction factor; electrical test yield; head-gimbel assembly; magnetic recording; optical interferometry; overcoat properties; pole tip recession measurement; slider surface roughness; throughput; Assembly; Electric variables measurement; Interferometers; Magnetic materials; Optical interferometry; Optical materials; Rough surfaces; Surface roughness; Testing; Throughput;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908575

Filename

908575