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A magnetic head can be formed to have a write-wide, read-narrow configuration by tapering the ferrite section of a two-gap ferrite core.
English (United States)
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Write Wide, Read narrow Ferrite Head
A magnetic head can be formed to have a write-wide, read-narrow
configuration by tapering the ferrite section of a two-gap ferrite core.
As shown in the figure, a two-gap ferrite core is assembled in the
conventional fashion by glass bonding, for instance, three ferrite blocks to form
magnetic gaps 2 and 3. Ceramic side pieces 4 and 5 are bonded to the ferrite
core 1, again using any conventional bonding technique such as glass. Air slots
6 and 7 are formed at a small acute angle 0 such that magnetic gap 3 is shorter
in length than magnetic gap 2. In the design of the figure, no ferrite-ceramic
interface is exposed at the operating surface of the head.
The narrower magnetic gap 3 can then be appropriately attuned to operate in
a "read-narrow" magnetic operation, and magnetic gap 2 can be a write-wide
configuration. The use of a magnetic core that is thicker than the track width
improves the magnetic performance of the core by providing an increased core
cross-section and by reducing the stress levels in the ferrite material.
Appropriate shielding can be included in the ferrite core to reduce
feedthrough to permit a read-while-write operation.
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