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This paper presents a numerical analysis of adjacent track erasure (ATE) when operating wrapped-around shielded perpendicular magnetic recording (PMR) heads. Micromagnetic finite element modeling was used to investigate the magnetization dynamics in a PMR writer including a soft underlayer, and the resultant magnetic field in the recording layer. It is found that the ATE-field is an asymmetric and localized return field. Such an asymmetry is determined by the directions of both the magnetization in the pole tip and the initial magnetization in the WAS. The ATE-field is located near the corner and the inner edge of one side-shield. It is also found that the ATE-field remains strong for most of the time during write-field switching.