Effect of side shields on neighbor-induced transition shift in perpendicular magnetic recording

摘要

The use of side shields is considered for the purpose of countering the neighbor-induced transition shift (NITS) in perpendicular magnetic recording. Two kinds of shield geometries are incorporated in the micromagnetic model. It is shown that, while the shields are ineffective against the worst case scenario, one shield design is highly effective in a less restrictive situation. It is further shown that the benefits (～65% reduction of NITS) only occur over a restricted range of shield saturation magnetization (M_s). Optimal shield M_s is found to be in the range of 500-800 emu/cc.