Micromagnetic recording model of pole-tip saturation effects

Auxiliary write-head fields, either from simple analytic approximations or from finite-element computations, are used to record transitions on a Landa u-Lifschitz-Gilbert model of thin-film recording media, A micromagnetic mod el of a magnetoresistive element is used to read back the transitions. Focu s is on the impact of pole-tip saturation on the quality of the recorded tr ack and subsequent playback. It is shown that with increasing write current , the quality of the recorded transitions degrades much more rapidly than w ould be expected from the analytical expressions for the write-head field. Specifically, head saturation causes the transition parameter to increase. At high write currents, poor write field gradients at the track edges resul t in a strong increase in transition parameter with read width percentage o f the recorded track.