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Multi-Track Magnetic Tape Write Head

IP.com Disclosure Number: IPCOM000038319D
Original Publication Date: 1989-Dec-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Nix, JL: AUTHOR [+2]

Abstract

In standard magnetic tape heads, glass is generally placed into the slots in the magnetic ferrite pieces to isolate the individual tracks. Instead of glass, impurities can be diffused into the magnetic ferrite at specific locations in order to provide the magnetic isolation.

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Multi-Track Magnetic Tape Write Head

In standard magnetic tape heads, glass is generally placed into the slots in the magnetic ferrite pieces to isolate the individual tracks. Instead of glass, impurities can be diffused into the magnetic ferrite at specific locations in order to provide the magnetic isolation.

A thin sheet of single crystal magnetic ferrite, such as manganese zinc ferrite, is bonded to a polycrystalline non- magnetic ceramic, using diffusion bonding techniques. The non-magnetic ceramic should have wear properties similar to that of the magnetic ferrite. The non-magnetic ceramic may be modified zirconium dioxide, magnesium oxide-zirconium oxide, for instance.

After the bonding operation, the magnetic ferrite is lapped to the desired thickness. A photoresist patterned mask is then placed on the magnetic ferrite. A selected cation impurity material is then deposited on the patterned magnetic ferrite surface. The photoresist is removed and the assembly is placed into a diffusion furnace. The impurity is diffused into the magnetic ferrite crystal at the specified location under the heat treatment. Cation materials are known to diffuse at different rates along different crystalline axes in single crystals. The single crystal magnetic ferrite would be cut and oriented such that the impurity cation would diffuse at a faster rate perpendicular to the ferrite surface rather than parallel to the surface. The diffusion is continued until the impurity ion ha...