Transition profile measurement

Author

Weismehl, K.R. ; Brug, J.A. ; Murdock, E.S.

Author_Institution

Dept. of Electr. Eng., Washington Univ., St. Louis, MO, USA

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

2497

Lastpage

2499

Abstract

The signal read by an inductive head from a recorded transition is proportional to the convolution of the head sensitivity functions with the gradient of the transition profile. With a known sensitivity function, the Fourier transform of the gradient of the transition profile, averaged over the medium thickness and track width, can be recovered from the transform of the signal by dividing it by the head sensitivity function transform. To assess the performance of the technique for thin-film heads, the sensitivity functions of several heads with different geometries have been measured. The signal read from a single transition with each of these heads is deconvolved, and the resulting inferred transition profiles are compared. Results are also shown for measurements using a single read head on transitions written with a series of different write currents and flying heights

Keywords

hard discs; magnetic heads; magnetic recording; Fourier transform; flying heights; hard disks; head geometries; head sensitivity function transform; head sensitivity functions; inductive head; inferred transition profiles; known sensitivity function; medium thickness; read signal deconvolution; recorded transition; single read head; thin-film heads; track width; transition profile; write currents; Convolution; Fourier transforms; Geometry; Laboratories; Magnetic field measurement; Magnetic flux; Magnetic heads; Transducers; Transistors; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92153

Filename

92153