Abstract
For a perpendicular writer, it is necessary to reduce the pole tip remanence as well as to improve the writing efficiency. To improve the writing efficiency for a narrow core width design, a tapered main pole geometry is proposed. We simulated the head remanence of the tapered main pole head with a micromagnetic model. To reduce the head pole tip remanence, a single magnetic domain structure forming a vortex state from the pole tip (ABS) to the tapered region is preferred. A tapered main pole structure with the trailing gap depth (TGD) below 30 nm and the tapered angle (TGθ) equal to about 30 degrees effectively improved the writing efficiency. This is achieved with a higher head field value of more than 1.3 times of the conventional structure. Moreover, the pole tip remanence is reduced to a value closer to the conventional structure.
