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Magnetic Recording Head, Write Structure with Chamfered Top-Pole, Top Corners to Reduce Adjacent Track Interference and Method of Making the Same

IP.com Disclosure Number: IPCOM000014740D
Original Publication Date: 2000-Dec-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 1 page(s) / 40K

Publishing Venue

IBM

Abstract

Described is a magnetic recording head write structure that mitigates spurious flux that emanates from the top corners of P2 which causes information on adjacent tracks to be degraded. By chamfering the top corners of P2, these spurious fringing fields emanating from the top corners of P2 that are responsible for adjacent track interference are thereby reduced. Also, described are methods for making a magnetic recording head write structure incorporating the chamfered P2 top corners.

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  Magnetic Recording Head, Write Structure with Chamfered Top-Pole, Top Corners to Reduce Adjacent Track Interference and Method of Making the Same

   Described is a magnetic recording head write structure that mitigates spurious flux that emanates from the top corners of P2 which causes information on adjacent tracks to be degraded. By chamfering the top corners of P2, these spurious fringing fields emanating from the top corners of P2 that are responsible for adjacent track interference are thereby reduced. Also, described are methods for making a magnetic recording head write structure incorporating the chamfered P2 top corners.

    It is known that fabricating a P2 layer with a large P2 thickness (P2T) dimension has advantages for over-write performance of a write head, but it also can cause "side-writing" which results from the top corners of the P2 flying over adjacent written tracks when the head is skewed, as it must be when accessing tracks at the OD and ID of a magnetic recording disk. This "side-writing" is due to spurious flux density emanating from the top corner of the P2 on one side of the written track which results in the "over-writing" of information on adjacent tracks and appears as an overall degradation of amplitude of the read-back signal from a track adjacent to a track which was previously written. As a consequence, the written track windage must be increased to prevent the fields from the top corners of the P2 from interfering with adjacent tracks, and consequently this limits areal density.

   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 corners at a top of the P2 are...