International Business Machines Corporation

Frederick Hayes Dill, Jr

Robert Fontana

Richard Hsiao

Hugo Alberto Emilio Santini

Eric James Lee

Peter Beverley Powell Phipps

In a first aspect a slurry is provided for chemically mechanically polishing alumina and nickel iron to a common plane and in a second aspect a slurry is provided for additionally chemically mechanically polishing copper to a common plane. The slurry includes a first concentration of colloidal silica, a second concentration of potassium and/or sodium persulfate and a third concentration of ammonium persulfate. In the first aspect the first and second concentrations are tailored to chemically mechanically polish the alumina and the nickel iron at the same rate to a common plane and in the second aspect the slurry includes a third concentration of ammonium persulfate at a proper ratio to the potassium or sodium persulfate to chemically mechanically polish the copper at the same rate as the other materials to the same plane.

Slurry for multi-material chemical mechanical polishing

A write head has a second pole tip layer, a coil layer and a write coil insulation layer that are planarized at their top surfaces. A thin top insulation layer insulates the top of the coil layer from a yoke portion of the second pole piece which is connected to the second pole tip layer in the pole tip region and connected to a first pole piece layer in a back gap region. In a preferred embodiment the write gap layer extends throughout the yoke region and provides the only insulation between the first pole piece layer and the coil layer. Further, it is preferred that the write coil insulation layer be an inorganic material such as silicon dioxide (SiO ). Several embodiments of the write head are provided along with novel methods of making.

Planar stitched write head having write coil insulated with inorganic insulation

A write head has a second pole tip layer, a coil layer and a write coil insulation layer that are planarized at their top surfaces. A thin top insulation layer insulates the top of the coil layer from a yoke portion of the second pole piece which is connected to the second pole tip layer in the pole tip region and connected to a first pole piece layer in a back gap region. In a preferred embodiment the write gap layer extends throughout the yoke region and provides the only insulation between the first pole piece layer and the coil layer. Further, it is preferred that the write coil insulation layer be an inorganic material such as silicon dioxide (SiO,). Several embodiments of the write head are provided along with novel methods of making.

Growing community of inventors

Salem, NY, United States of America

Frederick Hayes Dill, Jr