Magnetic core and coil design for double perpendicular magnetic recording (PMR) writers

A dual perpendicular magnetic recording (PMR) writer formed on a slider in a head gimbal assembly (HGA), comprising:

• (a) a first main pole layer having a first pole tip with a leading side and trailing side at an air bearing surface (ABS), and bisected by a first plane that is orthogonal to the ABS;
• (b) a second main pole layer having a second pole tip with a leading side and trailing side at the ABS, and bisected by a second plane that is orthogonal to the ABS, the second plane is a first cross-track width from the first plane;
• (c) a bucking coil (BC) with a front side that is between the first and second planes, recessed from the ABS, and formed below the first and second main pole layers, the bucking coil comprises:
• (1) a BC first outer portion that adjoins a BC center portion proximate to the BC front side and first plane;
• (2) a BC second outer portion that adjoins the BC center portion proximate to the BC front side and second plane, and wherein the BC first and second outer portions and the BC front side form a substantially U shape;
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• (3) the BC center portion with a substantially rectangular shape that extends from the BC front side to a backend that contacts an interconnect;
• (d) a driving coil (DC) with a front side that is between the first and second planes, recessed from the ABS, and formed above the first and second main pole layers, the driving coil comprises:
• (1) a DC first outer portion that adjoins a DC center portion proximate to the DC front side and first plane;
• (2) a DC second outer portion that adjoins the DC center portion proximate to the DC front side and second plane, and wherein the DC first and second outer portions and the DC front side form a substantially U shape;
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• (3) the DC center portion with a substantially rectangular shape that extends from the DC front side to a backend that contacts the interconnect;
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• (e) the interconnect that completes a circuit such that a first write current passing from the BC first outer portion through the BC center portion and interconnect to the DC center portion and then to the DC first outer portion generates flux in the first main pole layer, or a second write current passing from the BC second outer portion through the BC center portion and interconnect to the DC center portion and then to the DC second outer portion generates flux in the second main pole layer for writing to a magnetic medium.