PP3 shape designs for shield domain control to improve either skip track erasure (STE) or write performance for perpendicular magnetic recording (PMR)
First Claim
1. A PMR writer with a shield structure, comprising:
- (a) a first trailing shield layer formed on a write gap and adjoining an air bearing surface (ABS), the write gap contacts a top surface of a main pole layer at the ABS; and
(b) a second (PP3) trailing shield that adjoins a top surface of the first trailing shield and with a front side having a center section at the ABS, the front side has two end sections parallel to the ABS and each having a near end proximate to the center section and a far end opposite the near end, and recessed a first distance from the ABS, the PP3 trailing shield is magnetically connected to a back portion of the main pole layer and has a top-down shape from a down-track direction perspective, comprising;
(1) the front side;
(2) a first side with a first end connected to the far end of each front side end section, and formed parallel to a center plane that is orthogonal to the ABS and which bisects the PP3 trailing shield center section, and a second end that is a second distance from the ABS;
(3) a backside that is a first height from the ABS, has a second width less than the first width, and is aligned parallel to the ABS; and
(4) a sloped section that connects to the second end of the first side and to an end of the backside on each side of the center plane.
1 Assignment
0 Petitions
Accused Products
Abstract
A shield structure for a PMR writer is disclosed and features a first trailing shield on a write gap, and a second (PP3) trailing shield on the first trailing shield and magnetically connected to the main pole layer. From a top-down view along the down-track direction, the PP3 trailing shield has various shapes to provide shape anisotropy such that following hard magnet or reverse magnet initialization, PP3 trailing shield magnetic orientation has a stable three domain configuration thereby minimizing skip track erasure (STE) or improving area density capability (ADC). At least one sloped side is introduced that forms an angle >90 degrees with the PP3 trailing shield backside. In other embodiments, a thinner leading shield may be used to improve STE. The PP3 trailing shield may have a dome shape or a planar shape from a down-track cross-sectional view.
-
Citations
8 Claims
-
1. A PMR writer with a shield structure, comprising:
-
(a) a first trailing shield layer formed on a write gap and adjoining an air bearing surface (ABS), the write gap contacts a top surface of a main pole layer at the ABS; and (b) a second (PP3) trailing shield that adjoins a top surface of the first trailing shield and with a front side having a center section at the ABS, the front side has two end sections parallel to the ABS and each having a near end proximate to the center section and a far end opposite the near end, and recessed a first distance from the ABS, the PP3 trailing shield is magnetically connected to a back portion of the main pole layer and has a top-down shape from a down-track direction perspective, comprising; (1) the front side; (2) a first side with a first end connected to the far end of each front side end section, and formed parallel to a center plane that is orthogonal to the ABS and which bisects the PP3 trailing shield center section, and a second end that is a second distance from the ABS; (3) a backside that is a first height from the ABS, has a second width less than the first width, and is aligned parallel to the ABS; and (4) a sloped section that connects to the second end of the first side and to an end of the backside on each side of the center plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification