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Browse Prior Art Database

Single Crystal/Polycrystalline Film Head

IP.com Disclosure Number: IPCOM000042821D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Kehr, WD: AUTHOR [+2]

Abstract

In the manufacture of ferrite magnetic heads with conductive polycrystalline manganese-zinc (MnZn) ferrite it has been found that etched surfaces of the polycrystalline ferrite are not sufficiently smooth to be readily insulated from subsequently deposited conductive layers by a thin insulating layer. Small pores are apparently enlarged when the polycrystalline ferrite is etched . These small pores are not fully bridged by the thin insulating layer so that a conductive path or short can be made through the insulating layer. If the etched surface is formed in a single crystal MnZn ferrite, a smooth pore-free surface is obtained. A thin insulating layer can then readily insulate the single crystal ferrite from subsequently deposited conductive layers.

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Single Crystal/Polycrystalline Film Head

In the manufacture of ferrite magnetic heads with conductive polycrystalline manganese-zinc (MnZn) ferrite it has been found that etched surfaces of the polycrystalline ferrite are not sufficiently smooth to be readily insulated from subsequently deposited conductive layers by a thin insulating layer. Small pores are apparently enlarged when the polycrystalline ferrite is etched . These small pores are not fully bridged by the thin insulating layer so that a conductive path or short can be made through the insulating layer. If the etched surface is formed in a single crystal MnZn ferrite, a smooth pore-free surface is obtained. A thin insulating layer can then readily insulate the single crystal ferrite from subsequently deposited conductive layers. In a preferred magnetic head configuration a single MnZn ferrite crystal would be crystallographically oriented to provide the best combination of magnetic properties and wear resistance and etched to provide buried zones for conductors to the head. Polycrystalline MnZn ferrite would be used for the head closure where such operations as machining and glassing would be required. The polycrystalline ferrite is more readily subjected to these latter processes. The figure shows a single crystal ferrite substrate 1 having an etched area 2 supporting insulating layer 3 and conductor
4. A further insulating layer 5 is formed to provide a gap 6 between the substrate 1 and the polycryst...