Three dimensional micromagnetic analysis of write head dynamics and field patterns

A three-dimensional micromagnetic tip model is utilized to study magnetization switching dynamics and the external head fields of a write head. For a flux rise time of 0.1 ns, the head field follows the input flux up to about 60% of saturation, and slowly approaches saturation. At a flux rise time of 0.5 ns, the head field follows the input flux closely. Calculated head held gradients agree well in the gap region with the theoretical Lindholm model. At the track edge, the perpendicular and crosstrack field components remain fairly constant.