Micromagnetic recording model of pole-tip saturation and medium orientation effects at 100 Gb/in(2)

The recording process at 100 Gb/in(2) is examined through the use of a rece ntly formulated micromagnetic model. The Finite Element Method is used to c alculate the write head field, the Landau-Lifshitz-Gilbert equations are so lved for the medium and a micromagnetic approach is used to model magnetore sistive play-back. Effects due to pole tip saturation as well as medium ani sotropy distributions (orientation ratio) are emphasized. At higher current s, pole-tip saturation causes recorded tracks to be significantly wider tha n the physical dimensions of the writer. Narrow reader dimensions also limi t the play-back signal. Both of these effects are significantly improved th rough the use of oriented media. Preliminary results using a novel techniqu e to model transition noise are also reported.