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Interleaved Magnetic Tape Head With Deposited Poletips

IP.com Disclosure Number: IPCOM000121908D
Original Publication Date: 1991-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 89K

Publishing Venue

IBM

Related People

Aboaf, JA: AUTHOR [+4]

Abstract

The write saturation performance characteristics of an interleaved, bidirectional, magnetic tape head operating in ferrite-trailing mode are not as good as those during operation in poletip-trailing mode. Interleaved tape heads include a ferrite substrate poletip with other materials, including another poletip, deposited thereon. The deposited poletip is typically manufactured from a soft magnetic material, such as NiFe. The mode of operation depends on the direction of tape travel; during ferrite-trailing mode, the tape travels across the gap towards the deposited poletip; in poletip-trailing mode, the tape travels towards the ferrite poletip. Regardless of write mode, a head experiences amplitude loss at high write currents.

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This is the abbreviated version, containing approximately 54% of the total text.

Interleaved Magnetic Tape Head With Deposited Poletips

      The write saturation performance characteristics of an
interleaved, bidirectional, magnetic tape head operating in
ferrite-trailing mode are not as good as those during operation in
poletip-trailing mode.  Interleaved tape heads include a ferrite
substrate poletip with other materials, including another poletip,
deposited thereon.  The deposited poletip is typically manufactured
from a soft magnetic material, such as NiFe.  The mode of operation
depends on the direction of tape travel; during ferrite-trailing
mode, the tape travels across the gap towards the deposited poletip;
in poletip-trailing mode, the tape travels towards the ferrite
poletip.  Regardless of write mode, a head experiences amplitude loss
at high write currents.  However, because of the lower saturation
moment of the ferrite poletip compared to that of the deposited
poletip, the amplitude loss is significantly more severe in
ferrite-trailing mode.  The problem thus presented is how to better
balance the saturation moments of the poletips.

      The aforementioned problem is solved by an interleaved tape
head having two deposited poletips.  Referring to the figure, the
additional deposited poletip is created directly on the ferrite
substrate 1.  The tape head is manufactured by first depositing a
thin, etch stop layer (not shown) on ferrite substrate 1.  Next, a
soft magnetic material is deposited and patterned using a photoresi...