Abstract
Overwrite characteristics are calculated by using a model in which erasure is incomplete because of the small head field, and in which phase modulation occurs as a result of the shifts in the locations of the transitions as causes of overwrite noise. If account is taken of the demagnetizing field from the leading-edge transition, which is found to be significantly affected by head-gap length and write core saturation, the calculated results show good agreement with experimental results for various values of the magnetomotive force, head-medium spacing, and recording density. It is found that a high head-field gradient as well as a large field is required to achieve good overwrite for high recording density; overwrite characteristics are therefore adversely affected by head pole saturation. NiFe/ CoNiFe (high Bs} laminated heads, which are able to keep the field gradient high, have better overwrite characteristics than NiFe heads.
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