Slanted bump design for magnetic shields in perpendicular write heads and method of making same
View Patent ↗Embodiments provide a slanted bump magnetic shield in a perpendicular write head. The slanted bump magnetic shield provides a small throat height to maximize magnetic flux for writing to a magnetic media such as a magnetic storage disk in a hard disk drive, while avoiding saturation.
1. A magnetic write head for a hard disk drive, comprising:
an air bearing surface (ABS);
a magnetic write pole having an end that defines part of the ABS;
a first non-magnetic layer disposed on the magnetic write pole and having an end at the ABS;
a seed layer disposed on the first non-magnetic layer, wherein the first non-magnetic layer and the seed layer have a combined first thickness;
a second non-magnetic layer disposed on the seed layer, wherein the second non-magnetic layer is recessed from the ABS and has a taper defined by an increasing thickness of the second non-magnetic layer from a second thickness at a first distance from the ABS, to a third thickness at a second distance from the ABS, where the third thickness is greater than the first thickness and the second distance is greater than the first distance; and
a magnetic shield disposed on the seed layer and the second non-magnetic layer.
2. The magnetic write head of claim 1 , wherein the first distance is between 20 nm and 150 nm.
3. The magnetic write head of claim 1 , wherein the first thickness is between 10 nm and 40 nm.
4. The magnetic write head of claim 1 , wherein a total maximum thickness of the first non-magnetic layer, the seed layer, and the second non-magnetic layer is between 40 nm and 300 nm.
5. The magnetic write head of claim 1 , wherein the taper forms an angle between about 10 degrees and about 70 degrees to the ABS.
6. The magnetic write head of claim 1 , wherein the taper comprises a first portion having a first taper angle and a second portion having a second taper angle, different from the first taper angle.
7. The magnetic write head of claim 6 , wherein the first taper angle is between about 10 degrees and about 70 degrees to the ABS.
8. The magnetic write head of claim 7 , wherein the second taper angle is between about 10 degrees and about 70 degrees to the ABS.
9. The magnetic write head of claim 1 , wherein the first non-magnetic layer comprises Al 2 O 3 .
10. The magnetic write head of claim 9 , wherein the seed layer comprises a material selected from the group consisting of ruthenium, rhodium, and iridium.
11. The magnetic write head of claim 10 , wherein the second non-magnetic layer comprises a material selected from the group consisting of Ta, TaO, SiC, Al 2 O 3 , and combinations thereof.
12. A hard disk drive, comprising:
a magnetic storage disk; and
a magnetic write head for writing data to the disc drive, the magnetic write head comprising:
an air bearing surface (ABS), adjacent to and facing the magnetic disk;
a magnetic write pole having an end substantially on the ABS;
a first non-magnetic layer disposed on the magnetic write pole and having an end at the ABS;
a seed layer disposed on the first non-magnetic layer, wherein the first non-magnetic layer and the seed layer have a first thickness;
a second non-magnetic layer disposed on the seed layer, wherein the second non-magnetic layer is recessed from the ABS and has a taper defined by an increasing thickness of the second non-magnetic layer from a second thickness at a first distance from the ABS, to a third thickness at a second distance from the ABS, where the third thickness is greater than the first thickness and the second distance is greater than the first distance; and
a magnetic shield disposed on the seed layer and the second non-magnetic layer.
13. The hard disk drive of claim 12 , wherein the first distance is between 20 nm and 150 nm.
14. The hard disk drive of claim 12 , wherein the first thickness is between 10 nm and 40 nm.
15. The hard disk drive of claim 12 , wherein a total maximum thickness of the first non-magnetic layer, the seed layer, and the second non-magnetic layer is between 40 nm and 300 nm.
16. The hard disk drive of claim 12 , wherein the taper forms an angle between about 10 degrees and about 70 degrees to the ABS.
17. The hard disk drive of claim 12 , wherein the taper comprises a first portion having a first taper angle and a second portion having a second taper angle, different from the first taper angle.
18. The hard disk drive of claim 17 , wherein the first taper angle is between about 10 degrees and about 70 degrees to the ABS.
19. The hard disk drive of claim 18 , wherein the second taper angle is between about 10 degrees and about 70 degrees to the ABS.
20. The hard disk drive of claim 12 , wherein the first non-magnetic layer comprises Al 2 O 3 .
21. The hard disk drive of claim 20 , wherein the seed layer comprises a material selected from the group consisting of ruthenium, rhodium, and iridium.
22. The hard disk drive of claim 21 , wherein the second non-magnetic layer comprises a material selected from the group consisting of Ta, TaO, SiC, Al 2 O 3 , and combinations thereof.