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Narrow Track Ferrite Magnetic Recording Head Structure

IP.com Disclosure Number: IPCOM000088600D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Brock, GW: AUTHOR [+3]

Abstract

Narrow track ferrite magnetic heads (approximately 7 micrometers) (Fig. 1), when produced by conventional methods are difficult to handle and suffer badly from edge chipping due to machining and wear. Magnetically, these heads are very inefficient due to their high path reluctance. Further, when such thin ferrite is sandwiched for support purposes between BTC (barium-titanium ceramic), the glass lines cause a high state of stress within the ferrite which severely affects and reduces the permeability of the core.

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Narrow Track Ferrite Magnetic Recording Head Structure

Narrow track ferrite magnetic heads (approximately 7 micrometers) (Fig. 1), when produced by conventional methods are difficult to handle and suffer badly from edge chipping due to machining and wear. Magnetically, these heads are very inefficient due to their high path reluctance. Further, when such thin ferrite is sandwiched for support purposes between BTC (barium-titanium ceramic), the glass lines cause a high state of stress within the ferrite which severely affects and reduces the permeability of the core.

Fig. 2 depicts a track width which is fabricated from a nonconventional, nonmechanical method. Due to the small value of H, interference fields on the media from the gap area of width E has an adverse effect (for example, erasure) on a length of magnetic media placed in proximity with the magnetic transducer.

To solve this problem, the head widths E are filled with a high conductivity material, such that the stray fields cause eddy currents within widths E. These eddy currents set up a resisting magnetic field to the field emanating from the head at position B, and thus attenuate the field. Another method is to coat the width W with a high permeability material to short the fields but this has the effect of reducing the flux density in W so that the thickness of a low permeability material, if used, would have to be of such dimension as not to reduce significantly the write field from W. The propertie...