Browse Prior Art Database

MR Head Current Biasing

IP.com Disclosure Number: IPCOM000121184D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 35K

Publishing Venue

IBM

Related People

Hannson, D: AUTHOR

Abstract

Disclosed is a method to adjust the biasing, and therefore the asymmetry, of a shielded magneto-resistive head using current conductors placed outside of the shields.

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This is the abbreviated version, containing approximately 100% of the total text.

MR Head Current Biasing

      Disclosed is a method to adjust the biasing, and therefore the
asymmetry, of a shielded magneto-resistive head using current
conductors placed outside of the shields.

      In a shielded magneto-resistive head the transverse biasing is
done in the space between the shields, e.g., in shunt biasing of soft
film biasing.  However, due to tolerances of the various parameters,
the resulting asymmetry may be outside the desired range.  Adding
conductors inside the shields is usually prohibited because of the
tolerance on the gap.

      A conductor placed outside the shield can be powered to provide
adjustment to the asymmetry.  The figure shows the basic design with
the biasing conductor placed outside the second shield.  Other
possible configurations are to have the biasing conductors on both
sides of the shields or to use the write coil in a merge design as
the biasing conductor.

      This design can be used to adjust the asymmetry for each
individual head after the initial asymmetry is measured and can also
be used to cancel external stray field effects.

      Disclosed anonymously.