Perpendicular magnetic write head with stepped write pole for reduced MCW dependency on skew angle
View Patent ↗A magnetic write head for perpendicular magnetic data recording having a notched write pole for reduced magnetic core width (MCW) dependence on skew. The write pole is configured with a notch that can extend to or slightly beyond the flare point of the write pole, and is formed on the leading portion of the write pole. The notch can have a notch depth, as measured from the ABS of 50-200 nm or about 120 nm. The notch can have a notch height, measured in the down track direction that is 40-90 nm or 20-90 percent of the write pole height.
1. A magnetic write head for perpendicular magnetic recording, comprising:
a magnetic write pole having a pole tip extending to an air bearing surface; and
a notch formed in the write pole, the notch extending to the air bearing surface;
wherein the pole tip of the write pole has a write pole height measured at the air bearing surface from a leading edge of the write pole to a trailing edge of the write pole, and wherein the notch has a notch height measured in a down track direction and wherein the notch height is about 63 percent of the write pole height.
2. A magnetic write head as in claim 1 wherein the notch has a notch depth, measured from the air bearing surface, of 50-200 nm.
3. A magnetic write head as in claim 1 wherein the notch has a notch depth, measured from the air bearing surface, of about 20% to 90% of pole tip height at ABS.
4. A magnetic write head as in claim 1 wherein the write pole has a flare point and wherein the notch extends from the air bearing surface to the flare point.
5. A magnetic write head as in claim 1 wherein the write pole has a flare point and wherein the notch extends from the air bearing surface to at least the flare point.
6. A magnetic write head as in claim 1 wherein the write pole has a flare point and wherein the notch extends from the air bearing surface to a point beyond the flare point.
7. A magnetic write head as in claim 1 wherein the notch has a height measured in a down track direction and wherein the notch height is 40-90 nm.
8. A magnetic write head as in claim 1 wherein the notch is filled with a non-magnetic material.
9. A magnetic write head as in claim 1 wherein the notch is filled with alumina.
10. A magnetic write head for perpendicular magnetic data recording, comprising:
a magnetic return pole extending to an air bearing surface;
a magnetic shaping layer;
a magnetic back gap layer disposed away from the air bearing surface and magnetically connecting the return pole with the magnetic shaping layer;
a magnetic write pole formed on and magnetically connected with the magnetic shaping layer, the magnetic write pole having a pole tip extending to the air bearing surface, the magnetic write pole having a notch formed in a leading portion of the write pole and extending to the air bearing surface;
wherein the pole tip of the write pole has a write pole height measured at the air bearing surface from a leading edge of the write pole to a trailing edge of the write pole, and wherein the notch has a notch height measured in a down track direction and wherein the notch height is about 63 percent of the write pole height.
11. A magnetic write head as in claim 10 wherein the notch has a notch depth, measured from the air bearing surface, of 50-200 nm.
12. A magnetic write head as in claim 10 wherein the notch has a notch depth, measured from the air bearing surface, of about 120 nm.
13. A magnetic write head as in claim 10 , wherein the write pole has a flare point and wherein the notch extends from the air bearing surface to the flare point.
14. A magnetic write head as in claim 10 wherein the write pole has a flare point and wherein the notch extends from the air bearing surface to at least the flare point.
15. A magnetic write head as in claim 10 wherein the write pole has a flare point and wherein the notch extends from the air bearing surface to a point beyond the flare point.
16. A magnetic write head as in claim 10 wherein the notch has a height measured in a down track direction and wherein the notch height is 40-90 nm.
17. A magnetic write head for perpendicular magnetic data recording, comprising:
a magnetic return pole extending to an air bearing surface;
a magnetic shaping layer;
a magnetic back gap layer disposed away from the air bearing surface and magnetically connecting the return pole with the magnetic shaping layer;
a magnetic write pole formed on and magnetically connected with the magnetic shaping layer, the magnetic write pole having a pole tip extending to the air bearing surface, the magnetic write pole having a notch formed in a leading portion of the write pole and extending to the air bearing surface;
wherein the notch has a height measured in a down track direction and wherein the notch height is about 70 nm.