Dual perpendicular magnetic recording (PMR) writer base structures and mirror imaged asymmetrical magnetic core shapes for reduced writer-writer spacing (WWS)

A dual perpendicular magnetic recording (PMR) writer, comprising:

• (a) a first main pole layer (MP1) in a first writer on a slider, and having a first main pole tip (T1) at an air bearing surface (ABS) wherein T1 is bisected by a first plane that is at a first cross-track position and orthogonal to the ABS;
• (b) a second main pole layer (MP2) in a second writer on the slider and having a second main pole tip (T2) at the ABS wherein T2 is bisected by a second plane that is orthogonal to the ABS and at a second cross-track position that is a writer-writer spacing (WWS) from the first plane, wherein MP1 and MP2 are mirror images with respect to a center plane that separates the first and second writers, and wherein each of MP1 and MP2 comprise:
• (1) a triangular shaped front portion having first and second sides extending from T1 or T2 to a backside at a first height from the ABS;
• and
• (2) a rectangular shaped back portion having a width “w”, an inner side and outer side each aligned orthogonal to the ABS and connecting a front side thereof to a backend, and wherein the rectangular shaped back portion is bisected by a third plane in MP1 that is a first cross-track distance farther from the center plane than the first plane, and is bisected by a fourth plane in MP2 that is the first cross-track distance farther from the center plane than the second plane;
• (c) a first top yoke (TY1) formed on MP1, and with a front side recessed from the ABS, and a second top yoke (TY2) formed on MP2, and with a front side recessed from the ABS;
• and
• (d) a first tapered bottom yoke (tBY1) adjoining a bottom side of MP1, and having a front side recessed from the ABS, and a second tapered bottom yoke (tBY2) adjoining a bottom side of MP2, and having a front side recessed from the ABS.

A method of forming a dual perpendicular magnetic recording (PMR) writer;

• comprising:
• (a) sequentially depositing a leading shield and a side shield (SS) layer on a substrate, forming a first opening with sides in the SS layer that is bisected by a first plane formed orthogonal to an air bearing surface (ABS) plane, and forming a second opening with sides in the SS layer bisected by a second plane formed parallel to the first plane and a first cross-track width therefrom, wherein the first and second openings expose a top surface of the leading shield;
• (b) depositing a gap layer on the leading shield top surface and on the sides of the first and second openings to partially fill said openings;
• (c) simultaneously plating a first main pole (MP1) layer to fill the first opening, and a second main pole (MP2) layer to fill the second opening wherein MP1 and MP2 are mirror images with respect to a center plane that separates MP1 and MP2;
• and
• (d) performing a lapping process to generate an ABS at the ABS plane, form a first pole tip (T1) in MP1 and a second pole tip (T2) in MP2 at the ABS, wherein T1 is bisected by the first plane and T2 is bisected by the second plane, and wherein each of MP1 and MP2 comprise:
• (1) a triangular shaped front portion having first and second sides extending from T1 or T2 to a backside at a first height from the ABS;
• and
• (2) a rectangular shaped back portion having a width “w”, an inner side and outer side each aligned orthogonal to the ABS and connecting a front side thereof to a backend, and wherein the rectangular shaped back portion is bisected by a third plane in MP1 that is a first cross-track distance farther from the center plane than the first plane, and is bisected by a fourth plane in MP2 that is the first cross-track distance farther from the center plane than the second plane.