Patent ID: 9721604
Date: 2017-08-01
CPC Classifications: G11B

Claim:
1. A perpendicular magnetic recording (PMR) writer, comprising: (a) a main pole with a leading edge at an air bearing surface (ABS) and formed at a first plane, and a trailing edge at the ABS and formed along a second plane where the first and second planes are parallel to each other and are orthogonal to the ABS, and to a center plane formed equidistant between two main pole sides that connect the leading edge to the trailing edge; (b) a gap layer surrounding the main pole at the ABS and comprising a write gap that contacts the trailing edge and has a first cross-track width, and a side gap layer adjoining the main pole sides and leading edge; (c) a composite side shield at the ABS and on each side of the center plane, comprising; (1) a 19-24 kG magnetic (first hot seed) layer with an inner sidewall adjoining the side gap layer and facing a write pole portion of the main pole, a second sidewall formed parallel to the ABS at a first height therefrom, and an outer side facing away from the write pole portion and adjoining a 10-16 kG magnetic layer; and (2) the 10-16 kG magnetic layer that has a third sidewall connected to an end of the second sidewall, the third sidewall has a far end at a side of the composite side shield; and (d) a composite trailing shield at the ABS and comprising: (1) a second 19-24 kG hot seed layer formed on a top surface of the write gap, and a 16-19 kG magnetic layer that adjoins a top surface and sidewalls of the second hot seed layer, and contacts a top surface of each 10-16 kG magnetic layer at the second plane, and wherein the write pole portion of the main pole has a curved side on each side of the center plane, each curved side extends from the ABS to a corner where the curved write pole side adjoins a flared side of a main pole back portion, a first portion of each curved side proximate to the ABS is formed at the first angle γ with respect to the center plane, and a second portion of each curved side proximate to the corner has a second angle θ of about 90±5 degrees with respect to the center plane where θ>γ.