Abstract
The optimum structure of a recording head for a double-layer perpendicular medium has been studied by calculating the head field and the stationary recorded magnetization with a magnetic recording simulation program. The perpendicular field gradient of the thin film ring head is the same shape as that of the Single Pole Type (SPT) head. However, because of the magnetic saturation of the medium under-layer, the field distribution of the thin film ring head changes drastically with the change of write current. A wider gap length reduces this change of the head field, therefore the wide gap thin film ring head is able to be used with a double-layer perpendicular medium. It is confirmed that the thin film coil type SPT head reduces the influence of the magnetic saturation of the medium under-layer and writes a sharp transition.
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