Magnetic head with stitched top pole layer and single layer coil or solenoidal coil
View Patent ↗A magnetic head is disclosed that has first and second substantially flat soft magnetic pole layers that are magnetically coupled together in a backgap region that is removed from the medium-facing surface; a soft magnetic pedestal having a leading edge and a trailing edge, the trailing edge adjoining the second pole layer adjacent to the medium-facing surface, the leading edge defining a throat area that is spaced from the first pole layer by a submicron nonferromagnetic gap and defining an apex area that is spaced from the first pole layer by a greater separation than the gap, the throat area meeting the apex area at a throat height; and a plurality of substantially parallel, electrically conductive sections disposed between the first and second pole layers, the conductive sections disposed in a single layer that is aligned along a plane that intersects the pedestal and the backgap region.
1. A magnetic head for writing information on a relatively-moving medium, the head having a leading end, a trailing end and a medium-facing surface, the head comprising:
a first substantially flat soft magnetic pole layer disposed in the head adjacent to the medium-facing surface and extending substantially perpendicular to the medium-facing surface;
a second substantially flat soft magnetic pole layer disposed in the head adjacent to the medium-facing surface and oriented substantially parallel to the first pole layer, the second pole layer spaced greater than one micron from the first pole layer and magnetically coupled to the first pole layer in a backgap region that is removed from the medium-facing surface;
a soft magnetic pedestal having a leading edge and a trailing edge, the trailing edge adjoining the second pole layer adjacent to the medium-facing surface, the leading edge defining a throat area that is spaced from the first pole layer by a submicron nonferromagnetic gap and defining an apex area that is spaced from the first pole layer by a greater separation than the gap, the throat area meeting the apex area at a throat height; and
a plurality of substantially parallel, electrically conductive sections disposed between the first and second pole layers, the conductive sections disposed in a single layer that is aligned along a plane that intersects the pedestal and the backgap region.
2. The head of claim 1 , wherein the conductive sections are part of a coil that winds around the second pole layer.
3. The head of claim 2 , wherein the conductive sections each have an elongated and straight dimension that is parallel to the medium-facing surface.
4. The head of claim 2 , wherein at least two of the conductive sections have a different length measured in a direction parallel to the medium facing surface.
5. The head of claim 2 , wherein the conductive sections each have an end portion disposed in the single layer and extending transversely to the remainder of that section.
6. The head of claim 1 , wherein the conductive sections are part of a coil that winds around the backgap region.
7. The head of claim 1 , further comprising an inorganic nonmagnetic insulating material that is disposed between the conductive sections.
8. The head of claim 1 , wherein the pedestal and the second pole layer have a flat interface.
9. The head of claim 1 , wherein the pedestal is closer than the second pole layer to the medium-facing surface.
10. The head of claim 1 , wherein the conductive sections include a soft magnetic material.
11. The head of claim 1 , wherein the conductive sections each have an elongated and straight dimension that is parallel to the medium-facing surface.
12. A magnetic head for writing information on a relatively-moving medium, the head having a leading end, a trailing end and a medium-facing surface, the head comprising:
a first substantially flat soft magnetic pole layer disposed in the head adjacent to the medium-facing surface and extending substantially perpendicular to the medium-facing surface;
a second substantially flat soft magnetic pole layer disposed in the head adjacent to the medium-facing surface and oriented substantially parallel to the first pole layer, the second pole layer spaced greater than one micron from the first pole layer and magnetically coupled to the first pole layer in a backgap region that is removed from the medium-facing surface;
a soft magnetic pedestal disposed adjacent to the medium-facing surface and having a leading edge and a trailing edge, the trailing edge having a flat interface with the second pole layer, the leading edge defining a throat area that is spaced from the first pole layer by a submicron nonferromagnetic gap and defining an apex area that slopes away from the first pole layer with increased distance from the medium-facing surface, the throat area meeting the apex area at a throat height; and
a plurality of substantially parallel, electrically conductive sections disposed between the first and second pole layers, the conductive sections disposed in a single layer that is aligned along a plane that intersects the pedestal and the backgap region.
13. The head of claim 12 , wherein the conductive sections are part of a coil that winds around the second pole layer.
14. The head of claim 13 , wherein the conductive sections each have an elongated and straight dimension that is parallel to the medium-facing surface.
15. The head of claim 13 , wherein at least two of the conductive sections have a different length measured in a direction parallel to the medium-facing surface.
16. The head of claim 13 , wherein the conductive sections each have an end portion disposed in the single layer and extending transversely to the remainder of that section.
17. The head of claim 12 , wherein the conductive sections are part of a coil that winds around the backgap region.
18. The head of claim 12 , further comprising an inorganic nonmagnetic insulating material that is disposed between the conductive sections.
19. The head of claim 12 , wherein the pedestal is closer than the second pole layer to the medium-facing surface.