Effect of Local Damping in Perpendicular Recording Head: a Micromagnetic Study

This article reports the effect of varying the damping in different individual sections of the perpendicular recording head (like the yoke, pole and soft underlayer (SUL) regions) affects the head switching speed. Two head designs were used: the shielded head and monopole head design. The head model used in this paper divided the head into five regions: a) soft underlayer, b) tip, c) confluence, d) yoke, and e) shield. Results show that higher damping generally results in higher field amplitudes because the head field rise time is improved.