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T-Head with Chamfered P3 Base Corners to Reduce Side-Writing and Method for Making the Same

IP.com Disclosure Number: IPCOM000014781D
Original Publication Date: 2000-Aug-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 1 page(s) / 33K

Publishing Venue

IBM

Abstract

Described is a magnetic recording head write structure that provides additional flux carrying capacity through a supplementary pole overlayer (P3) which is situated above a conventional top pole (P2) of a write element, having a lateral dimension (P3B) wider than a written track determined by a width of the top pole at a write gap (P2B), a so-called T-head structure, and yet is essentially free from side-writing anomalies that attend high fringing fields that emanate from bottom corners of P3 in proximity to P2 at an air-bearing surface (ABS). The fringing fields are reduced by chamfering the bottom corners of P3. The device structure is essentially a T-head with chamfered P3 base corners. Also, described are methods for making the same.

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  T-Head with Chamfered P3 Base Corners to Reduce Side-Writing and Method for Making the Same

   Described is a magnetic recording head write structure that provides
additional flux carrying capacity through a supplementary pole overlayer (P3)
which is situated above a conventional top pole (P2) of a write element, having a
lateral dimension (P3B) wider than a written track determined by a width of the
top pole at a write gap (P2B), a so-called T-head structure, and yet is
essentially free from side-writing anomalies that attend high fringing fields
that emanate from bottom corners of P3 in proximity to P2 at an air-bearing
surface (ABS). The fringing fields are reduced by chamfering the bottom corners
of P3. The device structure is essentially a T-head with chamfered P3 base
corners. Also, described are methods for making the same.

   It is known that adding a P3 layer of wider dimension than P2 has advantages
for over-write performance of a write head, but it also can cause "side-writing"
which appears as satellite tracks parallel to the central track written by the
gap. In microtrack profiles, these satellite tracks appear as "bumps" of
anomalous flux density on either side of the written track profile. As a
consequence, the written track windage is increased by these side-tracks which
limits areal density. The origin of these satellite tracks has been confirmed by
micro-Kerr microscopy of the pole tips which shows high flux concentrations
emanating from the bottom corners of P3.

   A preferred, first embodiment of the invention comprises a magnetic recording
head write structure having a write head element with a bottom pole (P1)
separated from a top pole (P2) by a write gap (G3); the top pole (P2) is disposed
in proximity to and underneath a supplementary pole overlayer (P3) having a wider
dimension (P3B) than a dimension (P2B) of...