Repeated writing causes adjacent track erasure. During multiple write cycles, the grains of neighboring tracks are exposed to the write field, which will lower the energy barrier. Grains in an adjacent track are likely to reverse their magnetization when the cumulated field expose time exceeds the transition time. The energy barrier of a grain subject to the write field is computed as a function of distance from the track center. For the same perpendicular writer and the same intergranular exchange field, the number of passes before erasure is orders of magnitudes higher in exchange spring media than in single phase media.

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