Perpendicular recording head with leading bump in the main pole having narrow leading gap (LG)
View Patent ↗In one embodiment, a perpendicular magnetic recording head includes a main magnetic pole; a leading shield below a leading side of the main magnetic pole; a leading gap between the leading shield and the main magnetic pole; a trailing shield above a trailing side of the main magnetic pole; a trailing gap between the trailing shield and the main magnetic pole; and a nonmagnetic leading bump between the main magnetic pole and the leading shield. Additional embodiments are also disclosed.
1. A perpendicular magnetic recording head, comprising:
a main magnetic pole;
a leading shield below a leading side of the main magnetic pole;
a leading gap between the leading shield and the main magnetic pole;
a trailing shield above a trailing side of the main magnetic pole;
a trailing gap between the trailing shield and the main magnetic pole; and
a nonmagnetic leading bump between the main magnetic pole and the leading shield,
wherein the leading bump is a separate layer from the leading gap,
wherein the leading bump extends to a media facing surface,
wherein the leading bump has a first portion, a thickness of the first portion increasing therealong in a direction away from the media facing surface.
2. The perpendicular magnetic recording head according to claim 1 , wherein the leading bump extends along the leading side of the main magnetic pole between the main magnetic pole and the leading gap.
3. The perpendicular magnetic recording head according to claim 1 , wherein the leading bump has a second portion extending from the first portion in a direction away from the media facing surface, a thickness of the second portion decreasing therealong in a direction away from the media facing surface.
4. The perpendicular magnetic recording head according to claim 3 , wherein portions of the leading and trailing sides of the main magnetic pole taper towards one another therealong in a direction towards the media facing surface.
5. The perpendicular magnetic recording head according to claim 4 , wherein the leading bump extends along the tapered portion of the leading side of the main magnetic pole between the main magnetic pole and the leading gap.
6. The perpendicular magnetic recording head according to claim 1 , wherein the leading bump has a triangular cross sectional shape along a plane dissecting the main magnetic pole in an in-track direction.
7. The perpendicular magnetic recording head according to claim 1 , further comprising a side shield on a cross track side of the main magnetic pole and a nonmagnetic side gap defined between the main magnetic pole and the side shield, wherein the leading gap is narrower than the side gap at the media facing surface.
8. The perpendicular magnetic recording head according to claim 1 , wherein the leading gap at a media facing surface thereof comprises a material selected from a group consisting of an oxide, and a nonmagnetic material.
9. The perpendicular magnetic recording head according to claim 1 , wherein portions of the leading and trailing sides of the main magnetic pole taper towards one another therealong in a direction towards the media facing surface.
10. The perpendicular magnetic recording head according to claim 9 , wherein the leading bump extends along the tapered portion of the leading side of the main magnetic pole.
11. A magnetic data storage system, comprising:
at least one perpendicular magnetic recording head as recited in claim 1 ;
a magnetic medium;
a drive mechanism for passing the magnetic medium over the at least one magnetic head; and
a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.
12. A perpendicular magnetic recording head,
comprising:
a main magnetic pole;
a leading shield below a leading side of the main magnetic pole;
a nonmagnetic leading gap between the leading shield and the main magnetic pole;
a trailing shield above a trailing side of the main magnetic pole;
a nonmagnetic trailing gap between the trailing shield and the main magnetic pole; and
a nonmagnetic leading bump between the main magnetic pole and the leading shield,
wherein a portion of the leading side of the main magnetic pole tapers towards the trailing side of the main magnetic pole therealong towards a media facing surface thereof;
wherein the leading bump has a first portion extending along the portion of the leading side, a thickness of the first portion increasing therealong in a direction away from the media facing surface;
wherein the leading bump has a triangular cross sectional shape along a plane dissecting the main magnetic pole in an in-track direction.
13. The perpendicular magnetic recording head according to claim 12 , wherein the leading gap at the media facing surface thereof comprises a material selected from a group consisting of an oxide, and a nonmagnetic material.
14. The perpendicular magnetic recording head according to claim 12 , wherein the leading bump has a second portion extending from the first portion in a direction away from the media facing surface and along the tapered portion of the main magnetic pole, a thickness of the second portion decreasing therealong in a direction away from the media facing surface.
15. The perpendicular magnetic recording head according to claim 14 , wherein a portion of the trailing side of the main magnetic pole tapers towards the leading side therealong in a direction towards the media facing surface.
16. The perpendicular magnetic recording head according to claim 12 , further comprising a side shield on a cross track side of the main magnetic pole and a nonmagnetic side gap defined between the main magnetic pole and the side shield, wherein the leading gap is narrower than the side gap at the media facing surface.
17. The perpendicular magnetic recording head according to claim 12 , wherein the leading bump is recessed from the media facing surface.
18. A magnetic data storage system, comprising:
at least one perpendicular magnetic recording head as recited in claim 12 ;
a magnetic medium;
a drive mechanism for passing the magnetic medium over the at least one magnetic head; and
a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.
19. A perpendicular magnetic recording head,
comprising:
a main magnetic pole;
a leading shield below a leading side of the main magnetic pole;
a nonmagnetic leading gap between the leading shield and the main magnetic pole;
a trailing shield above a trailing side of the main magnetic pole;
a nonmagnetic trailing gap between the trailing shield and the main magnetic pole; and
a nonmagnetic leading bump between the main magnetic pole and the leading shield,
wherein portions of the leading and trailing sides of the main magnetic pole taper towards one another therealong in a direction towards a media facing surface,
wherein the leading bump extends along the tapered portion of the leading side of the main magnetic pole,
wherein the leading bump has a first portion, a thickness of the first portion increasing therealong in a direction away from the media facing surface,
wherein the leading bump has a second portion extending from the first portion in a direction away from the media facing surface, a thickness of the second portion decreasing therealong in a direction away from the media facing surface,
wherein the leading bump has a triangular cross sectional shape along a plane dissecting the main magnetic pole in an in-track direction.
20. The perpendicular magnetic recording head according to claim 19 , wherein the leading bump is recessed from the media-facing surface.
21. A magnetic data storage system, comprising:
at least one perpendicular magnetic recording head as recited in claim 19 ;
a magnetic medium;
a drive mechanism for passing the magnetic medium over the at least one magnetic head; and
a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.