Systems and methods for providing magnetic recording heads adapted for writing shingled tracks
View Patent ↗A magnetic recording head including a write pole and a shield. The write pole has a pole tip face that is parallel to the air bearing surface of the magnetic recording head, a leading surface having a leading edge at the pole face, a first side surface having a first side edge at the pole face, a second side surface having a second side edge at the pole face, and a trailing surface having a trailing edge at the pole face. The shield surrounds the first side surface, the trailing surface, and the second side surface of the write pole tip, and is separated from the first side surface of the write pole tip by a first side gap, from the trailing surface of the write pole tip by a trailing gap, and from the second side surface of the write pole tip by a second side gap. There is a notch formed in the inner wall of the shield adjacent to the corner of the write pole tip formed by one side surface and the trailing surface of the write pole tip.
1. A magnetic recording head comprising:
a write pole tip having a pole face arranged parallel to an air bearing surface of the magnetic recording head, a leading surface having a leading edge at the pole face, a first side surface having a first side edge at the pole face, a second side surface having a second side edge at the pole face, and a trailing surface having a trailing edge at the pole face;
a shield surrounding the first side surface, the trailing surface, and the second side surface of the write pole tip, wherein the shield is separated from the first side surface of the write pole tip by a first side gap, from the trailing surface of the write pole tip by a trailing gap, and from the second side surface of the write pole tip by a second side gap; and
a first notch formed in an inner wall of the shield adjacent to a first corner of the write pole tip formed by the first side surface of the write pole tip and the trailing surface of the write pole tip,
wherein the first side surface of the write pole tip comprises a first bottom portion arranged at a first angle from a normal to the leading surface of the write pole tip, and a first top portion arranged a second angle greater than the first angle from the normal to the leading surface of the write pole tip, and
wherein the second side surface of the write pole tip comprises a second bottom portion arranged at the first angle from the normal to the leading surface of the write pole tip, and a second top portion arranged at the second angle from the normal to the leading surface of the write pole tip.
2. The magnetic recording head according to claim 1 , wherein the first notch comprises a leading wall arranged co-planar with the trailing surface of the write pole tip, a trailing wall parallel to and separated from the leading wall by a first distance, and a distal wall perpendicular to the leading and trailing walls and separated from the inner surface of the shield by a second distance.
3. The magnetic recording head according to claim 2 , wherein the second distance from the inner wall of the shield to the distal wall of the first notch is between 10 and 50 nanometers.
4. The magnetic recording head according to claim 3 , wherein the second distance from the inner wall of the shield to the distal wall of the first notch is 40 nanometers.
5. The magnetic recording head according to claim 2 , wherein the first distance between the leading and trailing walls of the first notch is equal to the trailing gap between the shield and the trailing surface of the write pole tip.
6. The magnetic recording head according to claim 2 , wherein the first distance between the leading and trailing walls of the first notch is between 20 and 150 nanometers.
7. The magnetic recording head according to claim 6 , the first distance is 30 nanometers.
8. The magnetic recording head according to claim 2 , wherein the first notch further comprises a proximal wall arranged co-planar with the first side surface of the write pole tip.
9. The magnetic recording head according to claim 2 , wherein the first notch further comprises a proximal wall arranged co-planar with a portion of the inner wall of the shield adjacent to the first side surface of the write pole tip.
10. The magnetic recording head according to claim 1 , further comprising a second notch formed in the inner wall of the shield adjacent to a second corner of the write pole tip formed by the second side surface of the write pole tip and the trailing surface of the write pole tip.
11. The magnetic recording head according to claim 1 , wherein the first angle is between 8 degrees and 15 degrees, and the second angle is between 15 degrees and 25 degrees.
12. The magnetic recording head according to claim 11 , wherein the first angle is 10 degrees.
13. The magnetic recording head according to claim 11 , wherein the second angle is 20 degrees.
14. A method for fabricating a magnetic recording head comprising the steps of:
forming a write pole tip having a pole face arranged parallel to an air bearing surface of the magnetic recording head, a leading surface having a leading edge at the pole face, a first side surface having a first side edge at the pole face, a second side surface having a second side edge at the pole face, and a trailing surface having a trailing edge at the pole face;
forming a shield surrounding the first side surface, the trailing surface, and the second side surface of the write pole tip, wherein the shield is separated from the first side surface of the write pole tip by a first side gap, from the trailing surface of the write pole tip by a trailing gap, and from the second side surface of the write pole tip by a second side gap; and
forming a first notch formed in an inner wall of the shield adjacent to a first corner of the write pole tip formed by the first side surface of the write pole tip and the trailing surface of the write pole tip,
wherein the first side surface of the write pole tip comprises a first bottom portion arranged at a first angle from a normal to the leading surface of the write pole tip, and a first top portion arranged a second angle greater than the first angle from the normal to the leading surface of the write pole tip, and
wherein the second side surface of the write pole tip comprises a second bottom portion arranged at the first angle from the normal to the leading surface of the write pole tip, and a second top portion arranged at the second angle from the normal to the leading surface of the write pole tip.
15. The method according to claim 14 , wherein the step of forming the first notch comprises:
forming a leading wall arranged co-planar with the trailing surface of the write pole tip;
forming a trailing wall parallel to and separated from the leading wall by a first distance; and
forming a distal wall perpendicular to the leading and trailing walls and separated from the inner surface of the shield by a second distance.
16. The method according to claim 15 , wherein the step of forming the first notch further comprises forming a proximal wall arranged co-planar with the first side surface of the write pole tip.
17. The method according to claim 15 , wherein the step of forming the first notch further comprises forming a proximal wall arranged co-planar with a portion of the inner wall of the shield adjacent to the first side surface of the write pole tip.
18. The method according to claim 14 , further comprising the step of forming a second notch in the inner wall of the shield adjacent to a second corner of the write pole tip formed by the second side surface of the write pole tip and the trailing surface of the write pole tip.