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Browse Prior Art Database

Multilayer Ceramic Slider for Thin Film Heads

IP.com Disclosure Number: IPCOM000078292D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Warwick, WA: AUTHOR

Abstract

A composite multielement thin-film head consists of a multilayer ceramic (MLC) slider 1, on which are deposited a number of thin-film transducing elements 2.

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Multilayer Ceramic Slider for Thin Film Heads

A composite multielement thin-film head consists of a multilayer ceramic (MLC) slider 1, on which are deposited a number of thin-film transducing elements 2.

Layers 3 are originally plastic sheets containing alumina which are punched to define 'via' holes at 4 and 5. Molybdenum trioxide paste is deposited to fill the holes 4 and 5 and to provide connecting strips 6 between them. The sheets are assembled into a stack and fused to form a shrunken ceramic block. Copper is introduced into the via holes and connecting strips 6 by capillary action, to form good conductive paths between an edge and the upper face of the stack.

The fused block is ground and lapped back at one edge to expose the via holes 5. Single-turn transducing elements 2 are deposited directly on the lapped face. A permalloy underlayer of a magnetic magnetic yoke 7 is deposited first, followed by a U-shaped single-turn conductive strip 8. The single turns 8 each have one long arm 9 making contact with one lapped via hole 5, and thence through one of strips 6 with one of via holes 4. The single turns 8 each also have one short arm 10 which is similarly connected, not shown. to one of the via holes
4. Finally, a permalloy overlayer is deposited to complete the yoke 7 and the base of the stack is ground back to expose the transducing gaps.

A modified arrangement, not shown, has a magnetic ferrite bottom layer added to the MLC stack. which makes the permalloy...