Recording head characterization using 1 μm wide discrete tracks

Author

Lambert, S.E. ; Williams, M.L.

Author_Institution

IBM Almaden Res. Center, San Jose, CA, USA

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

2832

Lastpage

2834

Abstract

Discrete tracks ~1-μm wide etched on the surface of a Co-alloy disk were used to determine the readback response of thin-film recording heads at various locations across the width of a head. The effective head width for readback decreases as the recording density increases and shows several small maxima for densities greater than 600 flux-reversals/mm. The location of these maxima is determined by the thickness of the pole tips. The shape of the frequency dependence of the readback amplitude (rolloff curve) changes considerably near the edges of the pole tips. A qualitative description of this behavior is presented using calculations from a three-dimensional model. The influence of edge effects due to unequal pole-tip widths is observed when rolloff curves on conventional media are compared with data acquired using a narrow discrete track

Keywords

magnetic heads; magnetic recording; magnetic thin film devices; 1 micron; Co alloy disc surface; discrete tracks; effective head width; frequency dependence; pole tip thickness; readback amplitude; readback response; recording density; rolloff curve; thin-film recording heads; three-dimensional model; Disk recording; Frequency measurement; Frequency response; Integral equations; Magnetic heads; Monitoring; Narrowband; Noise reduction; Solid modeling; Writing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92260

Filename

92260