Trailing edge shielded pole head is the primary writer design for perpendicular recording (PMR) with soft under layer (SUL), due to its higher field gradient compared to a single pole head. [1] However, since the perpendicular field component underneath the trailing shield (TS) is opposite to that from the main pole (MP), the bits will experience this reverse field right after being written by the MP. In this paper, we will demonstrate that, both by modeling and by experiments, with certain combinations of head, media, SUL, and write current, the return field induced partial erasure (RFPE) will occur, causing recording performance degradation. Therefore, head, media and system optimizations are necessary in order to avoid this issue.
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