US 5,719,730 A · Low fringe-field and narrow write-track magneto-resistive (MR) magnetic read-write head

Abstract

A low fringe-field and narrow write-track magnetic read-write head. The low fringe-field and narrow write-track magnetic read-write head includes a first pole layer formed adjoining an insulator layer over a substrate. The first pole layer has a first air bearing surface which has a first edge adjoining and parallel with a first surface of the insulator layer. The low fringe-field and narrow write-track magnetic read-write head also includes a second pole layer separated from the first pole layer by the insulator layer. The second pole layer has a width no greater than about 20 microns and a width no greater than about 100 percent of the width of the first pole layer where the width of the second pole layer is contained within the width of the first pole layer. The second pole layer also has a second air bearing surface coplanar with the first air bearing surface. The second air bearing surface has a second edge adjoining and parallel with a second surface of the insulator layer parallel and opposite from the first surface of the insulator layer. Finally, there is removed at least one portion of at least one of: (1) the second air bearing surface including at least one outer portion of the second edge; and (2) the first air bearing surface including at least one portion of the first edge most closely adjoining but not opposite the second edge.

Claims20

Dependent claims

A low fringe-field and narrow write-track magnetic read-write head comprising:

a substrate;
a first pole layer formed over the substrate, the first pole layer having a first width and the first pole layer having a first air bearing surface;
an insulator layer formed upon the first pole layer, the insulator layer being a gap filing insulator layer;
and
a second pole layer formed upon the insulator layer, the second pole layer having a second width contained within the first width of the first pole layer, the second pole layer having a second air bearing surface coplanar with the first air bearing surface of the first pole layer, the first air bearing surface and the second air bearing surface being separated by the insulator layer, the first pole layer having a first edge contiguous with the first air bearing surface of the first pole layer at the interface of the first pole layer with the insulator layer, the second pole layer having a second edge contiguous with the second air bearing surface of the second pole layer at the interface of the second pole layer with the insulator layer, where there is formed into at least one of the first pole layer and the second pole layer at least one aperture, the aperture(s) being formed within at least one of:
the second air bearing surface including at least one outermost portion of the second edge:
and
the first air bearing surface including at least one portion of the first edge most closely adjacent but not opposite the second edge.

5 more elements

A method for forming a low fringe-field and narrow write-track magnetic read-write head comprising:

providing a substrate;
forming over the substrate a first pole layer, the first pole layer having a first width and the first pole layer having a first air bearing surface;
forming an insulator layer upon the first pole layer, the insulator layer being a gap filing insulator layer;
forming a second pole layer upon the insulator layer, the second pole layer having a second width contained within the first width of the first pole layer, the second pole layer having a second air bearing surface coplanar with the first air bearing surface of the first pole layer, the first air bearing surface and the second air bearing surface being separated by the insulator layer, the first pole layer having a first edge contiguous with the first air bearing surface of the first pole layer at the interface of the first pole layer with the insulator layer, the second pole layer having a second edge contiguous with the second air bearing surface of the second pole layer at the interface of the second pole layer with the insulator layer, and
forming into at least one of the first pole layer and the second pole layer at least one aperture, the aperture(s) being formed within at least one of;
the second air bearing surface including at least one outermost portion of the second edge:
and
the first air bearing surface including at least one portion of the first edge most closely adjacent but not opposite the second edge.

5 more elements

Dependencies are inferred from the claim text.

Low fringe-field and narrow write-track magneto-resistive (MR) magnetic read-write head

Life of this patent

Low fringe-field and narrow write-track magneto-resistive (MR) magnetic read-write head

Life of this patent

Abstract

Claims20