Non-uniform write gap perpendicular writer for shingle writing

摘要

A PMR writer is disclosed that includes a recessed center section in the write pole trailing edge and a center recessed trailing shield to improve the field gradient at track edge. In all embodiments, there is a non-uniform write gap between the trailing edge and the trailing shield. The recessed portion of the write pole trailing edge and/or center recess of the trailing shield has a thickness from 10 to 40 nm in a down-track direction and a width in a cross-track direction of 20 to 200 nm. The distance between the center recess and a corner of the trailing edge is from 20 to 80 nm. A sequence of steps is provided to fabricate the two embodiments of the present invention.

主权项

1. A PMR writer for shingle writing, comprising:
(a) a write pole formed along an air bearing surface (ABS) with a leading edge and sections of a trailing edge formed parallel to a top surface of a substrate, and having two sides wherein each side intersects the trailing edge at a corner, said trailing edge comprises:
(1) a first end section that terminates at a first corner and is formed parallel to the substrate;(2) a second end section that terminates at a second corner and is formed parallel to the substrate; and(3) a recessed center section connecting the first and second end sections and wherein the recessed center section is a single curved arc that is formed a lesser distance from the substrate than the first and second end sections; (b) a write gap formed on the trailing edge and having a non-planar top surface, comprising:
(1) a first write gap end section formed parallel to the trailing edge and aligned above the first corner of the write pole;(2) a second write gap end section formed parallel to the trailing edge and aligned above the second corner of the write pole; and(3) a convex curve shaped center section connecting the first and second write gap end sections and wherein the convex curve shaped center section is formed a greater distance from the trailing edge than the first and second write gap end sections such that a variable first thickness of the write gap below the convex curve shaped center section is greater than a fixed second thickness below the first and second write gap end sections; (c) a side gap that adjoins each side of the write pole and having a side formed substantially parallel to a nearest side of the write pole and located a gap distance therefrom; (d) a side shield that adjoins a side of each side gap and interfaces with an overlying trailing shield; and (e) the trailing shield that adjoins a top surface of each side shield and is formed on the top surface of the write gap.