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This article describes heads for magnetic disk files. The concepts described apply to all recording systems that use a mechanical motion to keep a head centered on track.
English (United States)
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Design of Separately Optimized Thin Film Read Write Magnetic Recording
This article describes heads for magnetic disk files. The concepts described
apply to all recording systems that use a mechanical motion to keep a head
centered on track.
It is a primary goal in the design of magnetic recording systems to increase
the spatial resolution of the transducers and to maximize the number of bits
stored in a given area. One method of improving the linear density is to optimize
the pole tip widths and the magnetic gaps of read and write elements separately.
This is commonly done in tape recording where separate heads are placed along
the tape path. However, it is uncommon in disk recording because mechanical
tolerances are so much tighter there. With this head design, separate read and
write elements are placed very close together ( ~10 mils) with
photolithographically determined tolerances on their relative placement.
Because they are separate, one can increase track density by making the read
element slightly narrower, thereby allowing a small tracking error to be tolerated
without encountering signals from adjacent tracks.
The basic idea is to fabricate thin film transducers using multiple masking
steps to permit variations in the thickness of each of the layers of the heads.
This permits the use of thinner layers (thin pole tips) at the head-to-medium
interface for the read head, allowing greater resolution. (The write head is
constrained by magnetic field saturation problems from having pole tip layers that
are too thin.)
The read element 10 (Fig. 1) and write element 20 (Fig. 2) appear side-by-
side on substrate 9. This allows for sep...