Browse Prior Art Database

Write-Wide, Read-Narrow Perpendicular Recording Head

IP.com Disclosure Number: IPCOM000119460D
Original Publication Date: 1991-Jan-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 1 page(s) / 52K

Publishing Venue

IBM

Related People

Beaulieu, TJ: AUTHOR

Abstract

One of the attributes of perpendicular recording, especially with dual-layer recording media, is that the recording is characterized by sharp transitions along the direction of media motion and by sharply defined TRACK profiles. This essential absence of any appreciable erase band during writing leads to off-track performance in the presence of old information which is inferior to that obtained with usual longitudinal recording with single-layer media. Numerous investigators have tried to improve the off-track performance of perpendicular components.

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Write-Wide, Read-Narrow Perpendicular Recording Head

      One of the attributes of perpendicular recording, especially
with dual-layer recording media, is that the recording is
characterized by sharp transitions along the direction of media
motion and by sharply defined TRACK profiles.  This essential absence
of any appreciable erase band during writing leads to off-track
performance in the presence of old information which is inferior to
that obtained with usual longitudinal recording with single-layer
media. Numerous investigators have tried to improve the off-track
performance of perpendicular components.

      This disclosure describes a recording head structure which
provides a readback trackwidth for dual-layer perpendicular recording
which is narrower than the written trackwidth.  This is accomplished
at high recording density by use of a thin-film recording head in
which the first P1 layer, the leading pole in recording, is made of
conventional NiFe with a trackwidth of P1W.  The second pole is
constructed out of higher moment material, and is fabricated using a
planarization process to have WIDER trackwidth than the first layer,
i.e. P2W > P1W.  The gap between the P1 and P2 layers is suitably
narrow for resolving the recording density, which is assumed to be
high in accordance with the small fly-height and thin dual-layer
media suitable for such high density recording.  The narrow readgap
will define a high resolution readback 'filter' only over a w...