Head for perpendicular recording with reduced erasure
A perpendicular writer of the present invention comprises a main pole connected to two return poles and further includes one or more shorting shields thereby reducing erasure field on double layer perpendicular media. The perpendicular writer may include side shorting shields connecting the first and second return poles thereby modifying the crosstrack field gradient. Additionally, the perpendicular writer may include a top shorting shield modifying the downtrack gradient and may additionally include a bottom shorting shield for further reduction of erasure fields. The distance between the main pole and the shorting shields may be modified to customize the write field gradient.
1. A transducing head having a writer portion comprising:
a main pole having a first end and a second end;
a coil positioned with respect to the main pole;
a return pole forming first and second return paths for magnetic flux extending from the second end of the main pole; and
a top shorting shield spaced from the main pole at approximately the first end of the main pole.
2. The transducing head of claim 1 wherein the writer portion additionally comprises a first side shorting shield that connects the first and second return paths and is spaced from the main pole at approximately the first end of the main pole.
3. The transducing head of claim 2 wherein the writer portion additionally comprises a second side shorting shield that connects the first and second return paths and is positioned on an opposite side of the main pole from the first side shorting shield and spaced from the main pole at approximately the first end of the main pole.
4. The transducing head of claim 3 wherein the first and second side shorting shields are formed of soft magnetic material for allowing magnetic flux to flow through the first and second side shorting shields into the first and second return paths.
5. The transducing head of claim 3 wherein the first side shorting shield and second side shorting shield are each spaced from the main pole at a distance to reduce erasure fields in a crosstrack direction.
6. The transducing head of claim 1 wherein the top shorting shield has a height extending away from an air bearing surface that is less than the height of the first and second return paths.
7. The transducing head of claim 1 additionally comprising a bottom shorting shield that has a height extending away from an air bearing surface that is less than the height of the first and second return paths.
8. The transducing head of claim 1 wherein the main pole is formed of high moment soft magnetic material.
9. The transducing head of claim 8 wherein the main pole additionally comprises a yoke of soft magnetic material.
10. The transducing head of claim 3 wherein:
the return pole comprises a first return pole and a second return pole connected at a back via opposite the air bearing surface;
the main pole is located between the first return pole and the second return pole, the main pole having its first end adjacent to the air bearing surface and its second end connected to the back via; and
wherein the first and second side shorting shields are in contact with the first and second return poles at approximately the air bearing surface.
11. The transducing head of claim 10 additionally comprising electrically conductive coils positioned with respect to the main pole for generation of magnetic flux.
12. The transducing head of claim 10 wherein the first and second side shorting shields are formed of soft magnetic material for conducting magnetic flux from the main pole into the first and second return poles by way of the first and second side shorting shields.
13. The transducing head of claim 10 additionally comprising a bottom shorting shield.
14. The transducing head of claim 10 wherein the top shorting shield contacts the first and second side shorting shields and the first return pole.
15. The transducing head of claim 14 additionally comprising a bottom shorting shield spaced from the main pole wherein the bottom shorting shield contacts the first and second side shorting shields and the second return pole.
16. A magnetic recording head, the magnetic recording head comprising:
a main pole having a first end;
a coil positioned with respect to the main pole for generation of magnetic flux;
a return pole forming first and second return paths for magnetic flux; and
a side shorting shield that connects the first and second return paths, is formed of soft magnetic material, and is spaced from the main pole at approximately the first end of the main pole.
17. The magnetic recording head of claim 16 additionally comprising a top shorting shield formed of soft magnetic material spaced from the main pole at approximately the first end of the main pole.
18. The magnetic recording head of claim 16 additionally comprising a second side shorting shield that connects the first and second return paths and is positioned on an opposite side of the main pole from the first side shorting shield and spaced from the main pole at approximately the first end of the main pole.
19. The magnetic recording head of claim 18 additionally comprising a top shorting shield spaced from the main pole at approximately the first end of the main pole.
20. The magnetic recording head of claim 18 additionally comprising a bottom shorting shield spaced from the main pole at approximately the first end of the main pole.
21. A magnetic recording head, the magnetic recording head comprising:
a main pole having a first end;
a coil positioned with respect to the main pole for generation of magnetic flux;
a return pole forming first and second return paths for magnetic flux; and
a top shorting shield that is formed of soft magnetic material and is spaced from main pole at approximately the first end of the main pole.
22. The magnetic recording head of claim 21 wherein the top shorting shield has a height extending away from an air bearing surface that is less than the height of the first and second return paths.
23. The magnetic recording head of claim 21 additionally comprising a bottom shorting shield spaced from the main pole at approximately the first end of the main pole.
24. The magnetic recording head of claim 22 wherein the bottom shorting shield has a height extending away from an air bearing surface that is less than the height of the first and second return paths.