NDLI: A thin-film head design technique to correct read pulse asymmetry

Content Provider	IEEE Xplore Digital Library
Author	Chao Chi
Copyright Year	1965
Abstract	The read characteristic pulse from a longitudinally oriented head/disk interface is asymmetric, and this can be viewed as phase distortion. One of the major causes is related to the record-demagnetizing process which is essentially non-symmetrical. A thin-film head design technique, capable of restoring the read pulse symmetry is conceived and simulated. By choosing different leading and trailing pole-piece thicknesses for compensation, it is possible to correct the phase distortion at the problem origin. For a 3370 type head/disk interface at 520 flux changes per millimeter, a 25% increase of the leading pole-piece thickness from that of a standard thin-film head can reduce worst cased (triplet pattern) amplitude variation from 8.5% to 1.3%. The corresponding peak shift is also marginally decreased. This thin-film head design technique is simple to implement and can eliminate the costly phase correction circuitry usually used for signal post processing.
Sponsorship	IEEE Magnetics Society
Starting Page	1569
Ending Page	1571
Page Count	3
File Size	254123
File Format	PDF
ISSN	00189464
Volume Number	21
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1985-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transistors Magnetic heads Thin film circuits Geometry Atmospheric modeling Phase distortion Integrated circuit modeling Optical pulses Pulse measurements Optical recording
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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