Study of overwritten magnetization at the off-track position

Overwritten magnetization at the off-track position is studied by using mic ro-magnetic simulation employing the Landau-Lifshitz-Gilbert equation. The nominal track width was 600 nm and bit length was 100 nm. The first bit of overwritten magnetization at large off-track distances more than 50 nm is c onnected with the third bit at high frequencies. This is due to the decreas e of the head field at the edge. The magnetization of the track edge is not quite reversed after completing overwrite. As the frequency increases, the head field decreases due to rise-time effects, so that overwrite cannot be completed normally. An increase in the resistivity of the head core materi al is useful in order to improve the off-track overwrite characteristics.