A new type of thin film inductive single-pole head for perpendicular magnetic recording has been developed to provide a writing head for perpendicular double layer media. The head consisted of a main pole, three thin-film conductive layers to drive the pole and a return path pole. A low inductance of around 1.5 nH and a small saturation magneto-motive force of less than 0.025 AT 0.p was obtained. The D 50 was 180 kFRPI with an MR head of 210 nm shield separation. The error rate at 310 kFRPI was 10 6. Head induced erasure, which is an issue for the singlepole head, was also investigated by experiments and calculations. Around 10 % output reduction in 20 Oe stray field was confirmed. Computer simulation predicted an improvement by reducing the permeability of the medium's underlayer.
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