Inductive transducer with reduced pole tip protrusion

A head for reading or writing information on a media, the head comprising:

• a solid body having a leading end, a trailing end, and a media-facing surface, said body including a substrate portion;
• first and second soft magnetic shield layers, said first shield layer separated from said substrate portion by a first layer of silicon dioxide, said second shield layer extending a first distance in a direction substantially perpendicular to said media-facing surface;
• a magnetic field sensor disposed between said shield layers;
• first and second soft magnetic pole layers separated from each other by a submicron, nonferromagnetic gap layer, said first and second pole layers magnetically coupled across said gap layer, said first pole layer separated from said second shield layer by a second layer of silicon dioxide, said first pole layer extending in a plane a second distance in said direction substantially perpendicular to said media-facing surface, said second distance being at least twice said first distance;
• an electrically conductive coil disposed in said body and including at least one coil section disposed adjacent to and electrically isolated from said first and second pole layers;
• and
• an electrically conductive nonferromagnetic apex region disposed between said first and second pole layers to decrease said magnetic coupling as said pole layers extend from said media-facing surface, said apex region having a trailing surface that is not parallel to and not perpendicular to said media-facing surface.

A head for reading or writing information on a media, the head comprising:

• a solid body having a leading end, a trailing end, and a media-facing surface, said body including a substrate portion;
• a magnetic core disposed in said body, said core including first and second soft magnetic pole layers magnetically coupled to each other as first and second pole tips in a region adjacent to said media-facing surface, said second pole layer disposed closer than said first pole layer to said trailing end;
• a submicron nonferromagnetic gap layer disposed between said pole tips;
• an electrically conductive coil disposed in a plane and having at least one coil section disposed adjacent to and electrically isolated from said first and second pole layers;
• and
• means for reducing protrusion of said pole tips from said media-facing surface, said means including:
• constraining thermal expansion of organic material adjoining said coil section with an inorganic nonferromagnetic apex region aligned with said plane and adjoining said gap layer between said pole layers, and
• disposing silicon dioxide between said core and said substrate.