Micromagnetic Study of Short and Long Yoke PMR Head With Trailing Shield

Abstract

The response of a trailing shielded perpendicular magnetic recording (PMR) write head with a three-turn two-layer coils is calculated using a full micromagnetic large scale model including return pole and soft underlayer. We study the effect of PMR yoke length and write current overshoot on the dynamic response of the head at high frequency. In particular, recording performance parameter, nonlinear transition shift (NLTS) is simulated using micromagnetic media model. Shorter yoke length head improves NLTS as compared with longer yoke length. Measured NLTS has qualitative agreement with micromagnetic model results.Index Terms-Head field dynamics, nonlinear transition shift (NLTS), perpendicular magnetic recording (PMR), write head, yoke length.

Modeling magnetic column intermediate layer of perpendicular magnetic recording

“…The damping constant is assumed to be 0.2 in all magnetic parts of the model. 5,6 The head field is calculated on a plane 15 nm below the ABS, and the field at the point where the field magnitude is maximum over the field calculation area is reported. 7 To simulate the head-field dynamics, the writer head is driven with an arbitrary write current with an overshoot.…”