Browse Prior Art Database

Use of Superconductors as Magnetic Insulators

IP.com Disclosure Number: IPCOM000109237D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 1 page(s) / 58K

Publishing Venue

IBM

Related People

Zappe, HH: AUTHOR

Abstract

The inventions disclosed are superconductors used as magnetic insulators. As a specific example these devices may be used in conjunction with thin-film magnetic heads to provide flux guiding and magnetic shielding.

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This is the abbreviated version, containing approximately 67% of the total text.

Use of Superconductors as Magnetic Insulators

       The inventions disclosed are superconductors used as
magnetic insulators.  As a specific example these devices may be used
in conjunction with thin-film magnetic heads to provide flux guiding
and magnetic shielding.

      When two inductive heads are placed side by side in piggy-back
fashion, they can be independently optimized for reading and writing.
In other words, one head of the pair is dedicated to reading, and the
other to writing.  Such independent optimization can substantially
improve read/write performance.

      However, such a structure has proven impractical because of
magnetic interaction between the heads.  Flux lines emanating from
the write head's pole tips interfere with the read head.  Similarly,
fields emanating from the air bearing surface interfere with the
write head.  Furthermore, as throat height increases, the
interference worsens.

      In an attempt to minimize interference, flux guides have been
placed between magnetic shields.  But these present another problem.
The guides channel flux from the written transitions to a sensor
placed inside the read head.  However, flux entering the flux guide
prefers to flow into the shields rather than to the sensor, thus
rendering the process inefficient.  As the distance from the air
bearing surface increases, flux available in the flux guide decreases
exponentially.

      Superconductors are ideal insulators of magnetic s...