Perpendicular magnetic write head with stitched notched trailing shield
View Patent ↗A magnetic write head for perpendicular magnetic recording having a stitched notched trailing shield. The trailing shield includes a first pedestal portion having sides that are self aligned with the sides of the write pole and having a back edge that extends a first shield throat height. The shield further includes a second shield portion stitched onto the pedestal portion, the second shield portion having a back edge that extends beyond the back edge of the pedestal portion.
1. A write head for perpendicular magnetic recording, comprising:
a magnetic write pole having a pole tip extending to an air bearing surface and having a trailing edge and a leading edge; and
a magnetic trailing shield that is separated from the trailing edge of the write pole by a non-magnetic trailing gap layer that is sandwiched between the magnetic trailing shield and the magnetic write pole;
the magnetic trailing shield further comprising:
a magnetic pedestal portion located adjacent to the non-magnetic trailing gap layer, the magnetic pedestal portion extending from the air bearing surface to a first trailing shield throat height (TH 1 ); and
a main shield portion that is magnetically connected with the magnetic pedestal portion, the main shield portion extending from the air bearing surface to a second throat height (TH 2 ) that is greater than TH 1 ;
wherein the pole tip of the write pole has first and second laterally opposed sides extending from the trailing edge to the leading edge, and wherein the magnetic pedestal portion of the trailing shield has first and second sides,
that are aligned with the first and second sides of the write pole at the trailing edge.
2. A magnetic write head as in claim 1 wherein TH 1 is 30-150 nm and TH 2 is 60-450 nm.
3. A magnetic write head as in claim 1 wherein TH 1 is 25 percent to 75 percent TH 2 .
4. A write head as in claim 1 wherein the pedestal portion has a thickness of 10-100 nm as measured from the non-magnetic trailing gap to the main shield portion.
5. A write head as in claim 1 wherein the magnetic pedestal portion and the main pedestal portion are constructed of the same material.
6. A write head as in claim 1 wherein the magnetic pedestal portion and the main shield portion are constructed of different magnetic materials.
7. A write head for perpendicular magnetic recording, comprising:
a magnetic write pole having a pole tip extending to an air bearing surface and having a trailing edge and a leading edge; and
a magnetic trailing shield that is separated from the trailing edge of the write pole by a non-magnetic trailing gap layer that is sandwiched between the magnetic trailing shield and the magnetic write pole;
the magnetic trailing shield further comprising:
a magnetic pedestal portion located adjacent to the non-magnetic trailing gap layer, the magnetic pedestal portion extending from the air bearing surface to a first trailing shield throat height (TH 1 ); and
a main shield portion that is magnetically connected with the magnetic pedestal portion, the main shield portion extending from the air bearing surface to a second throat height (TH 2 ) that is greater than TH 1 ; wherein:
the pole tip of the write pole has first and second laterally opposed sides extending from the trailing edge to the leading edge;
the magnetic pedestal portion of the trailing shield has first and second sides that are aligned with the first and second sides of the write pole at the trailing edge; and
the main shield portion extends beyond the first and second sides of the magnetic pedestal portion.
8. A write head as in claim 7 wherein the pedestal portion has a thickness of 10-100 nm as measured from the non-magnetic trailing gap to the main shield portion.