Dual write heater for slider surface topography control in double perpendicular magnetic recording (PMR) writers

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

• (a) a first main pole layer in a first PMR writer having a first main pole tip with a leading side and trailing side at an air bearing surface (ABS), and bisected by a first plane that is at a first cross-track position and is orthogonal to the ABS, and wherein the first PMR writer is formed on a slider;
• (b) a second main pole layer in a second PMR writer formed on the slider, and having a second main pole tip with a leading side and trailing side at the ABS, and bisected by a second plane that is orthogonal to the ABS, wherein the first and second planes are equidistant from a center plane that separates the first and second PMR writers;
• (c) a first bucking coil that is formed below the first main pole layer in the first PMR writer, and is connected to a first driving coil or a common driving coil with a first interconnect;
• (d) a second bucking coil formed below the second main pole layer in the second PMR writer;
• and is connected to a second driving coil or the common driving coil with a second interconnect;
• (e) a first dynamic fly height (DFH) heater coil (WDFH1) formed above the first bucking coil in the first PMR writer;
• and
• (f) a second DFH heater coil (WDFH2) formed above the second bucking coil in the second PMR writer, wherein WDFH1 and WDFH2 are configured to adjust a close point proximate to the first plane when the first PMR writer is selected for a write process, and to adjust the close point proximate to the second plane when the second PMR writer is selected for a write process.

A method of adjusting a write gap (WG) protrusion close point position during a write process with a first perpendicular magnetic recording (PMR) writer, or during a write process with a second PMR writer in a dual PMR writer;

• comprising:
• (a) providing a first main pole in the first PMR writer with a first main pole tip which is bisected by a first plane that is orthogonal to an air bearing surface (ABS);
• (b) providing a second main pole in the second PMR writer with a second main pole tip that is bisected by a second plane that is orthogonal to the ABS, and wherein the first and second planes are equidistant from a center plane that separates the first and second PMR writers on a slider in a head gimbal assembly (HGA);
• (c) providing a first circuit comprised of a bucking coil portion, a driving coil portion, and an interconnect between the BC and DC portions in the first circuit through which a write current is sent to activate the first PMR writer for a write process;
• (d) providing a second circuit comprised of a bucking coil portion, a driving coil portion, and the interconnect between the BC and DC portions in the second circuit through which a write current is sent to activate the second PMR writer for a write process;
• (e) forming a first dynamic fly height (DFH) heater coil (WDFH1) between the BC and DC portions in the first circuit, and a second DFH heater coil (WDFH2) between the BC and DC portions in the second circuit so that at least WDFH1 is activated during a write process with the first PMR writer, and at least WDFH2 is activated during a write process with the second PMR writer;
• and
• (f) applying a first power to WDFH1 and a second power to WDFH2 to give a WDFH1:WDFH2 power ratio from 100:0 to 0:100 that adjusts the close point position toward the first plane during a write process with the first PMR writer, or toward the second plane during a write process with the second PMR writer.