Availability of a standard thin film ring head merged to MR sensor was investigated for perpendicular double-layered media. It was found side-writing or erasure by the wide upper shield of the head took place under unsuitable writing condition which is harmful for high track density. Since a merged type thin film ring head acts like a single pole head with return path of upper shield, the side-writing by the upper shield appears at excess writing current. However the influence was found to be negligible by optimization of the recording MMF and head pole structure.
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Yamada et al. (1997) studied this question.
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