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Making Electromagnetic Shields Including Ferrite

IP.com Disclosure Number: IPCOM000078502D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Kehr, WD: AUTHOR [+2]

Abstract

Electromagnetic shields are used to reduce interference and cross-talk, for example, between heads in multitrack and read/write magnetic transducers. Electromagnetic shields consist of a laminated structure of lamina of conductive, metallic, magnetically nonpermeable material and lamina of magnetically permeable material. When the lamina are combined and placed in a magnetic transducer, they form an electromagnetic shield that functions to prevent electric and magnetic interference from head-to-head.

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Making Electromagnetic Shields Including Ferrite

Electromagnetic shields are used to reduce interference and cross-talk, for example, between heads in multitrack and read/write magnetic transducers. Electromagnetic shields consist of a laminated structure of lamina of conductive, metallic, magnetically nonpermeable material and lamina of magnetically permeable material. When the lamina are combined and placed in a magnetic transducer, they form an electromagnetic shield that functions to prevent electric and magnetic interference from head-to-head.

Electromagnetic shields including ferrite as the magnetically permeable material are produced by brazing. In producing a ferrite containing electromagnetic shield by brazing, the magnetically permeable ferrite is first metallized by sputtering a thin chromium containing metal layer on the ferrite at the joint site. Following metallization, a silver containing brazing alloy is located at the joint site between the metallized ferrite and the to-be-joined metallic, conductive, magnetically nonpermeable material. The ferrite and metal are then joined by brazing. The conductive, metallic, magnetically nonpermeable material is, for example, copper, brass, silver, bronze, phosphor-bronze, aluminum, titanium, or a similar material.

The metallization of the ferrite with chromium containing metal by sputtering provides a metal surface having good adherence to the ferrite, as well as providing a metal surface capable of good adhe...