Appeal No. 1996-3811
Application 08/188,078
DECISION ON APPEAL
This is a decision on appeal under 35 U.S.C. § 134 from
the final rejection of claims 1-19.
We reverse.
BACKGROUND
The invention is directed to a thin film head and
method of making such a head, wherein seedlayers which
provide a bond to both the underlayer and the magnetic
material of the pole are formed of non-magnetic material.
When writing data to a disk, write current in a coil
orients magnetic domains in the pole magnetic material so
that the poles generate a desired magnetic field. When the
write current is removed, the magnetic domains should return
to a relaxed or stable state. However, in some cases the
write current causes an irreversible orientation of magnetic
domains in the magnetic material which causes distortion in
read signals generated by the head during a subsequent read
operation. Appellants state that they discovered that the
magnetic seedlayers increase external magnetic force on the
magnetic layers, thereby increasing the likelihood that the
head will not return to a stable state following a write
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